GrGLProgram.cpp revision 798c8c4fe61f2172ae52cb626843a64069e18882 
1/*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#include "GrGLProgram.h"
9
10#include "GrAllocator.h"
11#include "GrEffect.h"
12#include "GrDrawEffect.h"
13#include "GrGLEffect.h"
14#include "GrGpuGL.h"
15#include "GrGLShaderVar.h"
16#include "SkTrace.h"
17#include "SkXfermode.h"
18
19#include "SkRTConf.h"
20
21SK_DEFINE_INST_COUNT(GrGLProgram)
22
23#define GL_CALL(X) GR_GL_CALL(fContext.interface(), X)
24#define GL_CALL_RET(R, X) GR_GL_CALL_RET(fContext.interface(), R, X)
25
26SK_CONF_DECLARE(bool, c_PrintShaders, "gpu.printShaders", false,
27                "Print the source code for all shaders generated.");
28
29#define COL_ATTR_NAME "aColor"
30#define COV_ATTR_NAME "aCoverage"
31#define EDGE_ATTR_NAME "aEdge"
32
33namespace {
34inline const char* declared_color_output_name() { return "fsColorOut"; }
35inline const char* dual_source_output_name() { return "dualSourceOut"; }
36}
37
38GrGLProgram* GrGLProgram::Create(const GrGLContext& gl,
39                                 const GrGLProgramDesc& desc,
40                                 const GrEffectStage* stages[]) {
41    GrGLProgram* program = SkNEW_ARGS(GrGLProgram, (gl, desc, stages));
42    if (!program->succeeded()) {
43        delete program;
44        program = NULL;
45    }
46    return program;
47}
48
49GrGLProgram::GrGLProgram(const GrGLContext& gl,
50                         const GrGLProgramDesc& desc,
51                         const GrEffectStage* stages[])
52: fContext(gl)
53, fUniformManager(gl) {
54    fDesc = desc;
55    fVShaderID = 0;
56    fGShaderID = 0;
57    fFShaderID = 0;
58    fProgramID = 0;
59
60    fColor = GrColor_ILLEGAL;
61    fColorFilterColor = GrColor_ILLEGAL;
62
63    for (int s = 0; s < GrDrawState::kNumStages; ++s) {
64        fEffects[s] = NULL;
65    }
66
67    this->genProgram(stages);
68}
69
70GrGLProgram::~GrGLProgram() {
71    if (fVShaderID) {
72        GL_CALL(DeleteShader(fVShaderID));
73    }
74    if (fGShaderID) {
75        GL_CALL(DeleteShader(fGShaderID));
76    }
77    if (fFShaderID) {
78        GL_CALL(DeleteShader(fFShaderID));
79    }
80    if (fProgramID) {
81        GL_CALL(DeleteProgram(fProgramID));
82    }
83
84    for (int i = 0; i < GrDrawState::kNumStages; ++i) {
85        delete fEffects[i];
86    }
87}
88
89void GrGLProgram::abandon() {
90    fVShaderID = 0;
91    fGShaderID = 0;
92    fFShaderID = 0;
93    fProgramID = 0;
94}
95
96void GrGLProgram::overrideBlend(GrBlendCoeff* srcCoeff,
97                                GrBlendCoeff* dstCoeff) const {
98    switch (fDesc.fDualSrcOutput) {
99        case GrGLProgramDesc::kNone_DualSrcOutput:
100            break;
101        // the prog will write a coverage value to the secondary
102        // output and the dst is blended by one minus that value.
103        case GrGLProgramDesc::kCoverage_DualSrcOutput:
104        case GrGLProgramDesc::kCoverageISA_DualSrcOutput:
105        case GrGLProgramDesc::kCoverageISC_DualSrcOutput:
106        *dstCoeff = (GrBlendCoeff)GrGpu::kIS2C_GrBlendCoeff;
107        break;
108        default:
109            GrCrash("Unexpected dual source blend output");
110            break;
111    }
112}
113
114namespace {
115
116// given two blend coeffecients determine whether the src
117// and/or dst computation can be omitted.
118inline void need_blend_inputs(SkXfermode::Coeff srcCoeff,
119                              SkXfermode::Coeff dstCoeff,
120                              bool* needSrcValue,
121                              bool* needDstValue) {
122    if (SkXfermode::kZero_Coeff == srcCoeff) {
123        switch (dstCoeff) {
124            // these all read the src
125            case SkXfermode::kSC_Coeff:
126            case SkXfermode::kISC_Coeff:
127            case SkXfermode::kSA_Coeff:
128            case SkXfermode::kISA_Coeff:
129                *needSrcValue = true;
130                break;
131            default:
132                *needSrcValue = false;
133                break;
134        }
135    } else {
136        *needSrcValue = true;
137    }
138    if (SkXfermode::kZero_Coeff == dstCoeff) {
139        switch (srcCoeff) {
140            // these all read the dst
141            case SkXfermode::kDC_Coeff:
142            case SkXfermode::kIDC_Coeff:
143            case SkXfermode::kDA_Coeff:
144            case SkXfermode::kIDA_Coeff:
145                *needDstValue = true;
146                break;
147            default:
148                *needDstValue = false;
149                break;
150        }
151    } else {
152        *needDstValue = true;
153    }
154}
155
156/**
157 * Create a blend_coeff * value string to be used in shader code. Sets empty
158 * string if result is trivially zero.
159 */
160inline void blend_term_string(SkString* str, SkXfermode::Coeff coeff,
161                       const char* src, const char* dst,
162                       const char* value) {
163    switch (coeff) {
164    case SkXfermode::kZero_Coeff:    /** 0 */
165        *str = "";
166        break;
167    case SkXfermode::kOne_Coeff:     /** 1 */
168        *str = value;
169        break;
170    case SkXfermode::kSC_Coeff:
171        str->printf("(%s * %s)", src, value);
172        break;
173    case SkXfermode::kISC_Coeff:
174        str->printf("((%s - %s) * %s)", GrGLSLOnesVecf(4), src, value);
175        break;
176    case SkXfermode::kDC_Coeff:
177        str->printf("(%s * %s)", dst, value);
178        break;
179    case SkXfermode::kIDC_Coeff:
180        str->printf("((%s - %s) * %s)", GrGLSLOnesVecf(4), dst, value);
181        break;
182    case SkXfermode::kSA_Coeff:      /** src alpha */
183        str->printf("(%s.a * %s)", src, value);
184        break;
185    case SkXfermode::kISA_Coeff:     /** inverse src alpha (i.e. 1 - sa) */
186        str->printf("((1.0 - %s.a) * %s)", src, value);
187        break;
188    case SkXfermode::kDA_Coeff:      /** dst alpha */
189        str->printf("(%s.a * %s)", dst, value);
190        break;
191    case SkXfermode::kIDA_Coeff:     /** inverse dst alpha (i.e. 1 - da) */
192        str->printf("((1.0 - %s.a) * %s)", dst, value);
193        break;
194    default:
195        GrCrash("Unexpected xfer coeff.");
196        break;
197    }
198}
199/**
200 * Adds a line to the fragment shader code which modifies the color by
201 * the specified color filter.
202 */
203void add_color_filter(GrGLShaderBuilder* builder,
204                      const char * outputVar,
205                      SkXfermode::Coeff uniformCoeff,
206                      SkXfermode::Coeff colorCoeff,
207                      const char* filterColor,
208                      const char* inColor) {
209    SkString colorStr, constStr;
210    blend_term_string(&colorStr, colorCoeff, filterColor, inColor, inColor);
211    blend_term_string(&constStr, uniformCoeff, filterColor, inColor, filterColor);
212
213    SkString sum;
214    GrGLSLAdd4f(&sum, colorStr.c_str(), constStr.c_str());
215    builder->fsCodeAppendf("\t%s = %s;\n", outputVar, sum.c_str());
216}
217}
218
219void GrGLProgram::genInputColor(GrGLShaderBuilder* builder, SkString* inColor) {
220    switch (fDesc.fColorInput) {
221        case GrGLProgramDesc::kAttribute_ColorInput: {
222            builder->addAttribute(kVec4f_GrSLType, COL_ATTR_NAME);
223            const char *vsName, *fsName;
224            builder->addVarying(kVec4f_GrSLType, "Color", &vsName, &fsName);
225            builder->vsCodeAppendf("\t%s = " COL_ATTR_NAME ";\n", vsName);
226            *inColor = fsName;
227            } break;
228        case GrGLProgramDesc::kUniform_ColorInput: {
229            const char* name;
230            fUniformHandles.fColorUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
231                                                            kVec4f_GrSLType, "Color", &name);
232            *inColor = name;
233            break;
234        }
235        case GrGLProgramDesc::kTransBlack_ColorInput:
236            GrAssert(!"needComputedColor should be false.");
237            break;
238        case GrGLProgramDesc::kSolidWhite_ColorInput:
239            break;
240        default:
241            GrCrash("Unknown color type.");
242            break;
243    }
244}
245
246void GrGLProgram::genUniformCoverage(GrGLShaderBuilder* builder, SkString* inOutCoverage) {
247    const char* covUniName;
248    fUniformHandles.fCoverageUni = builder->addUniform(GrGLShaderBuilder::kFragment_ShaderType,
249                                                       kVec4f_GrSLType, "Coverage", &covUniName);
250    if (inOutCoverage->size()) {
251        builder->fsCodeAppendf("\tvec4 uniCoverage = %s * %s;\n",
252                               covUniName, inOutCoverage->c_str());
253        *inOutCoverage = "uniCoverage";
254    } else {
255        *inOutCoverage = covUniName;
256    }
257}
258
259namespace {
260void gen_attribute_coverage(GrGLShaderBuilder* builder,
261                            SkString* inOutCoverage) {
262    builder->addAttribute(kVec4f_GrSLType, COV_ATTR_NAME);
263    const char *vsName, *fsName;
264    builder->addVarying(kVec4f_GrSLType, "Coverage", &vsName, &fsName);
265    builder->vsCodeAppendf("\t%s = " COV_ATTR_NAME ";\n", vsName);
266    if (inOutCoverage->size()) {
267        builder->fsCodeAppendf("\tvec4 attrCoverage = %s * %s;\n", fsName, inOutCoverage->c_str());
268        *inOutCoverage = "attrCoverage";
269    } else {
270        *inOutCoverage = fsName;
271    }
272}
273}
274
275void GrGLProgram::genGeometryShader(GrGLShaderBuilder* builder) const {
276#if GR_GL_EXPERIMENTAL_GS
277    // TODO: The builder should add all this glue code.
278    if (fDesc.fExperimentalGS) {
279        GrAssert(fContext.info().glslGeneration() >= k150_GrGLSLGeneration);
280        builder->fGSHeader.append("layout(triangles) in;\n"
281                                   "layout(triangle_strip, max_vertices = 6) out;\n");
282        builder->gsCodeAppend("\tfor (int i = 0; i < 3; ++i) {\n"
283                              "\t\tgl_Position = gl_in[i].gl_Position;\n");
284        if (fDesc.fEmitsPointSize) {
285            builder->gsCodeAppend("\t\tgl_PointSize = 1.0;\n");
286        }
287        GrAssert(builder->fGSInputs.count() == builder->fGSOutputs.count());
288        int count = builder->fGSInputs.count();
289        for (int i = 0; i < count; ++i) {
290            builder->gsCodeAppendf("\t\t%s = %s[i];\n",
291                                   builder->fGSOutputs[i].getName().c_str(),
292                                   builder->fGSInputs[i].getName().c_str());
293        }
294        builder->gsCodeAppend("\t\tEmitVertex();\n"
295                              "\t}\n"
296                              "\tEndPrimitive();\n");
297    }
298#endif
299}
300
301const char* GrGLProgram::adjustInColor(const SkString& inColor) const {
302    if (inColor.size()) {
303          return inColor.c_str();
304    } else {
305        if (GrGLProgramDesc::kSolidWhite_ColorInput == fDesc.fColorInput) {
306            return GrGLSLOnesVecf(4);
307        } else {
308            return GrGLSLZerosVecf(4);
309        }
310    }
311}
312
313namespace {
314// prints a shader using params similar to glShaderSource
315void print_shader(GrGLint stringCnt,
316                  const GrGLchar** strings,
317                  GrGLint* stringLengths) {
318    for (int i = 0; i < stringCnt; ++i) {
319        if (NULL == stringLengths || stringLengths[i] < 0) {
320            GrPrintf(strings[i]);
321        } else {
322            GrPrintf("%.*s", stringLengths[i], strings[i]);
323        }
324    }
325}
326
327// Compiles a GL shader, returns shader ID or 0 if failed params have same meaning as glShaderSource
328GrGLuint compile_shader(const GrGLContext& gl,
329                        GrGLenum type,
330                        int stringCnt,
331                        const char** strings,
332                        int* stringLengths) {
333    SK_TRACE_EVENT1("GrGLProgram::CompileShader",
334                    "stringCount", SkStringPrintf("%i", stringCnt).c_str());
335
336    GrGLuint shader;
337    GR_GL_CALL_RET(gl.interface(), shader, CreateShader(type));
338    if (0 == shader) {
339        return 0;
340    }
341
342    const GrGLInterface* gli = gl.interface();
343    GrGLint compiled = GR_GL_INIT_ZERO;
344    GR_GL_CALL(gli, ShaderSource(shader, stringCnt, strings, stringLengths));
345    GR_GL_CALL(gli, CompileShader(shader));
346    GR_GL_CALL(gli, GetShaderiv(shader, GR_GL_COMPILE_STATUS, &compiled));
347
348    if (!compiled) {
349        GrGLint infoLen = GR_GL_INIT_ZERO;
350        GR_GL_CALL(gli, GetShaderiv(shader, GR_GL_INFO_LOG_LENGTH, &infoLen));
351        SkAutoMalloc log(sizeof(char)*(infoLen+1)); // outside if for debugger
352        if (infoLen > 0) {
353            // retrieve length even though we don't need it to workaround bug in chrome cmd buffer
354            // param validation.
355            GrGLsizei length = GR_GL_INIT_ZERO;
356            GR_GL_CALL(gli, GetShaderInfoLog(shader, infoLen+1,
357                                             &length, (char*)log.get()));
358            print_shader(stringCnt, strings, stringLengths);
359            GrPrintf("\n%s", log.get());
360        }
361        GrAssert(!"Shader compilation failed!");
362        GR_GL_CALL(gli, DeleteShader(shader));
363        return 0;
364    }
365    return shader;
366}
367
368// helper version of above for when shader is already flattened into a single SkString
369GrGLuint compile_shader(const GrGLContext& gl, GrGLenum type, const SkString& shader) {
370    const GrGLchar* str = shader.c_str();
371    int length = shader.size();
372    return compile_shader(gl, type, 1, &str, &length);
373}
374
375}
376
377// compiles all the shaders from builder and stores the shader IDs
378bool GrGLProgram::compileShaders(const GrGLShaderBuilder& builder) {
379
380    SkString shader;
381
382    builder.getShader(GrGLShaderBuilder::kVertex_ShaderType, &shader);
383    if (c_PrintShaders) {
384        GrPrintf(shader.c_str());
385        GrPrintf("\n");
386    }
387
388    if (!(fVShaderID = compile_shader(fContext, GR_GL_VERTEX_SHADER, shader))) {
389        return false;
390    }
391
392    if (builder.fUsesGS) {
393        builder.getShader(GrGLShaderBuilder::kGeometry_ShaderType, &shader);
394        if (c_PrintShaders) {
395            GrPrintf(shader.c_str());
396            GrPrintf("\n");
397        }
398        if (!(fGShaderID = compile_shader(fContext, GR_GL_GEOMETRY_SHADER, shader))) {
399            return false;
400        }
401    } else {
402        fGShaderID = 0;
403    }
404
405    builder.getShader(GrGLShaderBuilder::kFragment_ShaderType, &shader);
406    if (c_PrintShaders) {
407        GrPrintf(shader.c_str());
408        GrPrintf("\n");
409    }
410    if (!(fFShaderID = compile_shader(fContext, GR_GL_FRAGMENT_SHADER, shader))) {
411        return false;
412    }
413
414    return true;
415}
416
417bool GrGLProgram::genProgram(const GrEffectStage* stages[]) {
418    GrAssert(0 == fProgramID);
419
420    const GrAttribBindings& attribBindings = fDesc.fAttribBindings;
421    bool hasExplicitLocalCoords =
422        SkToBool(attribBindings & GrDrawState::kLocalCoords_AttribBindingsBit);
423    GrGLShaderBuilder builder(fContext.info(), fUniformManager, hasExplicitLocalCoords);
424
425#if GR_GL_EXPERIMENTAL_GS
426    builder.fUsesGS = fDesc.fExperimentalGS;
427#endif
428
429    SkXfermode::Coeff colorCoeff, uniformCoeff;
430    // The rest of transfer mode color filters have not been implemented
431    if (fDesc.fColorFilterXfermode < SkXfermode::kCoeffModesCnt) {
432        GR_DEBUGCODE(bool success =)
433            SkXfermode::ModeAsCoeff(static_cast<SkXfermode::Mode>
434                                    (fDesc.fColorFilterXfermode),
435                                    &uniformCoeff, &colorCoeff);
436        GR_DEBUGASSERT(success);
437    } else {
438        colorCoeff = SkXfermode::kOne_Coeff;
439        uniformCoeff = SkXfermode::kZero_Coeff;
440    }
441
442    // no need to do the color filter if coverage is 0. The output color is scaled by the coverage.
443    // All the dual source outputs are scaled by the coverage as well.
444    if (GrGLProgramDesc::kTransBlack_ColorInput == fDesc.fCoverageInput) {
445        colorCoeff = SkXfermode::kZero_Coeff;
446        uniformCoeff = SkXfermode::kZero_Coeff;
447    }
448
449    // If we know the final color is going to be all zeros then we can
450    // simplify the color filter coefficients. needComputedColor will then
451    // come out false below.
452    if (GrGLProgramDesc::kTransBlack_ColorInput == fDesc.fColorInput) {
453        colorCoeff = SkXfermode::kZero_Coeff;
454        if (SkXfermode::kDC_Coeff == uniformCoeff ||
455            SkXfermode::kDA_Coeff == uniformCoeff) {
456            uniformCoeff = SkXfermode::kZero_Coeff;
457        } else if (SkXfermode::kIDC_Coeff == uniformCoeff ||
458                   SkXfermode::kIDA_Coeff == uniformCoeff) {
459            uniformCoeff = SkXfermode::kOne_Coeff;
460        }
461    }
462
463    bool needColorFilterUniform;
464    bool needComputedColor;
465    need_blend_inputs(uniformCoeff, colorCoeff,
466                      &needColorFilterUniform, &needComputedColor);
467
468    // the dual source output has no canonical var name, have to
469    // declare an output, which is incompatible with gl_FragColor/gl_FragData.
470    bool dualSourceOutputWritten = false;
471    builder.fHeader.append(GrGetGLSLVersionDecl(fContext.info().binding(),
472                                                fContext.info().glslGeneration()));
473
474    GrGLShaderVar colorOutput;
475    bool isColorDeclared = GrGLSLSetupFSColorOuput(fContext.info().glslGeneration(),
476                                                   declared_color_output_name(),
477                                                   &colorOutput);
478    if (isColorDeclared) {
479        builder.fFSOutputs.push_back(colorOutput);
480    }
481
482    const char* viewMName;
483    fUniformHandles.fViewMatrixUni = builder.addUniform(GrGLShaderBuilder::kVertex_ShaderType,
484                                                        kMat33f_GrSLType, "ViewM", &viewMName);
485
486
487    builder.vsCodeAppendf("\tvec3 pos3 = %s * vec3(%s, 1);\n"
488                          "\tgl_Position = vec4(pos3.xy, 0, pos3.z);\n",
489                          viewMName, builder.positionAttribute().getName().c_str());
490
491    // incoming color to current stage being processed.
492    SkString inColor;
493
494    if (needComputedColor) {
495        this->genInputColor(&builder, &inColor);
496    }
497
498    // we output point size in the GS if present
499    if (fDesc.fEmitsPointSize && !builder.fUsesGS){
500        builder.vsCodeAppend("\tgl_PointSize = 1.0;\n");
501    }
502
503    ///////////////////////////////////////////////////////////////////////////
504    // compute the final color
505
506    // if we have color stages string them together, feeding the output color
507    // of each to the next and generating code for each stage.
508    if (needComputedColor) {
509        SkString outColor;
510        for (int s = 0; s < fDesc.fFirstCoverageStage; ++s) {
511            if (GrGLEffect::kNoEffectKey != fDesc.fEffectKeys[s]) {
512                // create var to hold stage result
513                outColor = "color";
514                outColor.appendS32(s);
515                builder.fsCodeAppendf("\tvec4 %s;\n", outColor.c_str());
516
517                builder.setCurrentStage(s);
518                fEffects[s] = builder.createAndEmitGLEffect(*stages[s],
519                                                            fDesc.fEffectKeys[s],
520                                                            inColor.size() ? inColor.c_str() : NULL,
521                                                            outColor.c_str(),
522                                                            &fUniformHandles.fSamplerUnis[s]);
523                builder.setNonStage();
524                inColor = outColor;
525            }
526        }
527    }
528
529    // if have all ones or zeros for the "dst" input to the color filter then we
530    // may be able to make additional optimizations.
531    if (needColorFilterUniform && needComputedColor && !inColor.size()) {
532        GrAssert(GrGLProgramDesc::kSolidWhite_ColorInput == fDesc.fColorInput);
533        bool uniformCoeffIsZero = SkXfermode::kIDC_Coeff == uniformCoeff ||
534                                  SkXfermode::kIDA_Coeff == uniformCoeff;
535        if (uniformCoeffIsZero) {
536            uniformCoeff = SkXfermode::kZero_Coeff;
537            bool bogus;
538            need_blend_inputs(SkXfermode::kZero_Coeff, colorCoeff,
539                              &needColorFilterUniform, &bogus);
540        }
541    }
542    const char* colorFilterColorUniName = NULL;
543    if (needColorFilterUniform) {
544        fUniformHandles.fColorFilterUni = builder.addUniform(
545                                                        GrGLShaderBuilder::kFragment_ShaderType,
546                                                        kVec4f_GrSLType, "FilterColor",
547                                                        &colorFilterColorUniName);
548    }
549    bool wroteFragColorZero = false;
550    if (SkXfermode::kZero_Coeff == uniformCoeff &&
551        SkXfermode::kZero_Coeff == colorCoeff) {
552        builder.fsCodeAppendf("\t%s = %s;\n", colorOutput.getName().c_str(), GrGLSLZerosVecf(4));
553        wroteFragColorZero = true;
554    } else if (SkXfermode::kDst_Mode != fDesc.fColorFilterXfermode) {
555        builder.fsCodeAppend("\tvec4 filteredColor;\n");
556        const char* color = adjustInColor(inColor);
557        add_color_filter(&builder, "filteredColor", uniformCoeff,
558                         colorCoeff, colorFilterColorUniName, color);
559        inColor = "filteredColor";
560    }
561
562    ///////////////////////////////////////////////////////////////////////////
563    // compute the partial coverage (coverage stages and edge aa)
564
565    SkString inCoverage;
566    bool coverageIsZero = GrGLProgramDesc::kTransBlack_ColorInput == fDesc.fCoverageInput;
567    // we don't need to compute coverage at all if we know the final shader
568    // output will be zero and we don't have a dual src blend output.
569    if (!wroteFragColorZero || GrGLProgramDesc::kNone_DualSrcOutput != fDesc.fDualSrcOutput) {
570
571        if (!coverageIsZero) {
572            switch (fDesc.fCoverageInput) {
573                case GrGLProgramDesc::kSolidWhite_ColorInput:
574                    // empty string implies solid white
575                    break;
576                case GrGLProgramDesc::kAttribute_ColorInput:
577                    gen_attribute_coverage(&builder, &inCoverage);
578                    break;
579                case GrGLProgramDesc::kUniform_ColorInput:
580                    this->genUniformCoverage(&builder, &inCoverage);
581                    break;
582                default:
583                    GrCrash("Unexpected input coverage.");
584            }
585
586            SkString outCoverage;
587            const int& startStage = fDesc.fFirstCoverageStage;
588            for (int s = startStage; s < GrDrawState::kNumStages; ++s) {
589                if (fDesc.fEffectKeys[s]) {
590                    // create var to hold stage output
591                    outCoverage = "coverage";
592                    outCoverage.appendS32(s);
593                    builder.fsCodeAppendf("\tvec4 %s;\n", outCoverage.c_str());
594
595                    builder.setCurrentStage(s);
596                    fEffects[s] = builder.createAndEmitGLEffect(
597                                                    *stages[s],
598                                                    fDesc.fEffectKeys[s],
599                                                    inCoverage.size() ? inCoverage.c_str() : NULL,
600                                                    outCoverage.c_str(),
601                                                    &fUniformHandles.fSamplerUnis[s]);
602                    builder.setNonStage();
603                    inCoverage = outCoverage;
604                }
605            }
606
607            // discard if coverage is zero
608            if (fDesc.fDiscardIfZeroCoverage && !outCoverage.isEmpty()) {
609                builder.fsCodeAppendf(
610                    "\tif (all(lessThanEqual(%s, vec4(0.0)))) {\n\t\tdiscard;\n\t}\n",
611                    outCoverage.c_str());
612            }
613        }
614
615        if (GrGLProgramDesc::kNone_DualSrcOutput != fDesc.fDualSrcOutput) {
616            builder.fFSOutputs.push_back().set(kVec4f_GrSLType,
617                                               GrGLShaderVar::kOut_TypeModifier,
618                                               dual_source_output_name());
619            bool outputIsZero = coverageIsZero;
620            SkString coeff;
621            if (!outputIsZero &&
622                GrGLProgramDesc::kCoverage_DualSrcOutput != fDesc.fDualSrcOutput && !wroteFragColorZero) {
623                if (!inColor.size()) {
624                    outputIsZero = true;
625                } else {
626                    if (GrGLProgramDesc::kCoverageISA_DualSrcOutput == fDesc.fDualSrcOutput) {
627                        coeff.printf("(1 - %s.a)", inColor.c_str());
628                    } else {
629                        coeff.printf("(vec4(1,1,1,1) - %s)", inColor.c_str());
630                    }
631                }
632            }
633            if (outputIsZero) {
634                builder.fsCodeAppendf("\t%s = %s;\n", dual_source_output_name(), GrGLSLZerosVecf(4));
635            } else {
636                SkString modulate;
637                GrGLSLModulate4f(&modulate, coeff.c_str(), inCoverage.c_str());
638                builder.fsCodeAppendf("\t%s = %s;\n", dual_source_output_name(), modulate.c_str());
639            }
640            dualSourceOutputWritten = true;
641        }
642    }
643
644    ///////////////////////////////////////////////////////////////////////////
645    // combine color and coverage as frag color
646
647    if (!wroteFragColorZero) {
648        if (coverageIsZero) {
649            builder.fsCodeAppendf("\t%s = %s;\n", colorOutput.getName().c_str(), GrGLSLZerosVecf(4));
650        } else {
651            SkString modulate;
652            GrGLSLModulate4f(&modulate, inColor.c_str(), inCoverage.c_str());
653            builder.fsCodeAppendf("\t%s = %s;\n", colorOutput.getName().c_str(), modulate.c_str());
654        }
655    }
656
657    ///////////////////////////////////////////////////////////////////////////
658    // insert GS
659#if GR_DEBUG
660    this->genGeometryShader(&builder);
661#endif
662
663    ///////////////////////////////////////////////////////////////////////////
664    // compile and setup attribs and unis
665
666    if (!this->compileShaders(builder)) {
667        return false;
668    }
669
670    if (!this->bindOutputsAttribsAndLinkProgram(builder,
671                                                isColorDeclared,
672                                                dualSourceOutputWritten)) {
673        return false;
674    }
675
676    builder.finished(fProgramID);
677    this->initSamplerUniforms();
678    fUniformHandles.fRTHeightUni = builder.getRTHeightUniform();
679
680    return true;
681}
682
683bool GrGLProgram::bindOutputsAttribsAndLinkProgram(const GrGLShaderBuilder& builder,
684                                                   bool bindColorOut,
685                                                   bool bindDualSrcOut) {
686    GL_CALL_RET(fProgramID, CreateProgram());
687    if (!fProgramID) {
688        return false;
689    }
690
691    GL_CALL(AttachShader(fProgramID, fVShaderID));
692    if (fGShaderID) {
693        GL_CALL(AttachShader(fProgramID, fGShaderID));
694    }
695    GL_CALL(AttachShader(fProgramID, fFShaderID));
696
697    if (bindColorOut) {
698        GL_CALL(BindFragDataLocation(fProgramID, 0, declared_color_output_name()));
699    }
700    if (bindDualSrcOut) {
701        GL_CALL(BindFragDataLocationIndexed(fProgramID, 0, 1, dual_source_output_name()));
702    }
703
704    // Bind the attrib locations to same values for all shaders
705    GL_CALL(BindAttribLocation(fProgramID,
706                               fDesc.fPositionAttributeIndex,
707                               builder.positionAttribute().c_str()));
708    GL_CALL(BindAttribLocation(fProgramID, fDesc.fColorAttributeIndex, COL_ATTR_NAME));
709    GL_CALL(BindAttribLocation(fProgramID, fDesc.fCoverageAttributeIndex, COV_ATTR_NAME));
710
711    if (fDesc.fAttribBindings & GrDrawState::kLocalCoords_AttribBindingsBit) {
712        GL_CALL(BindAttribLocation(fProgramID,
713                                   fDesc.fLocalCoordsAttributeIndex,
714                                   builder.localCoordsAttribute().c_str()));
715    }
716
717    const GrGLShaderBuilder::AttributePair* attribEnd = builder.getEffectAttributes().end();
718    for (const GrGLShaderBuilder::AttributePair* attrib = builder.getEffectAttributes().begin();
719         attrib != attribEnd;
720         ++attrib) {
721         GL_CALL(BindAttribLocation(fProgramID, attrib->fIndex, attrib->fName.c_str()));
722    }
723
724    GL_CALL(LinkProgram(fProgramID));
725
726    GrGLint linked = GR_GL_INIT_ZERO;
727    GL_CALL(GetProgramiv(fProgramID, GR_GL_LINK_STATUS, &linked));
728    if (!linked) {
729        GrGLint infoLen = GR_GL_INIT_ZERO;
730        GL_CALL(GetProgramiv(fProgramID, GR_GL_INFO_LOG_LENGTH, &infoLen));
731        SkAutoMalloc log(sizeof(char)*(infoLen+1));  // outside if for debugger
732        if (infoLen > 0) {
733            // retrieve length even though we don't need it to workaround
734            // bug in chrome cmd buffer param validation.
735            GrGLsizei length = GR_GL_INIT_ZERO;
736            GL_CALL(GetProgramInfoLog(fProgramID,
737                                      infoLen+1,
738                                      &length,
739                                      (char*)log.get()));
740            GrPrintf((char*)log.get());
741        }
742        GrAssert(!"Error linking program");
743        GL_CALL(DeleteProgram(fProgramID));
744        fProgramID = 0;
745        return false;
746    }
747    return true;
748}
749
750void GrGLProgram::initSamplerUniforms() {
751    GL_CALL(UseProgram(fProgramID));
752    // We simply bind the uniforms to successive texture units beginning at 0. setData() assumes this
753    // behavior.
754    GrGLint texUnitIdx = 0;
755    for (int s = 0; s < GrDrawState::kNumStages; ++s) {
756        int numSamplers = fUniformHandles.fSamplerUnis[s].count();
757        for (int u = 0; u < numSamplers; ++u) {
758            UniformHandle handle = fUniformHandles.fSamplerUnis[s][u];
759            if (GrGLUniformManager::kInvalidUniformHandle != handle) {
760                fUniformManager.setSampler(handle, texUnitIdx);
761                ++texUnitIdx;
762            }
763        }
764    }
765}
766
767///////////////////////////////////////////////////////////////////////////////
768
769void GrGLProgram::setData(GrGpuGL* gpu,
770                          GrColor color,
771                          GrColor coverage,
772                          SharedGLState* sharedState) {
773    const GrDrawState& drawState = gpu->getDrawState();
774
775    this->setColor(drawState, color, sharedState);
776    this->setCoverage(drawState, coverage, sharedState);
777    this->setMatrixAndRenderTargetHeight(drawState);
778
779    // Setup the SkXfermode::Mode-based colorfilter uniform if necessary
780    if (GrGLUniformManager::kInvalidUniformHandle != fUniformHandles.fColorFilterUni &&
781        fColorFilterColor != drawState.getColorFilterColor()) {
782        GrGLfloat c[4];
783        GrColorToRGBAFloat(drawState.getColorFilterColor(), c);
784        fUniformManager.set4fv(fUniformHandles.fColorFilterUni, 0, 1, c);
785        fColorFilterColor = drawState.getColorFilterColor();
786    }
787
788    GrGLint texUnitIdx = 0;
789    for (int s = 0; s < GrDrawState::kNumStages; ++s) {
790        if (NULL != fEffects[s]) {
791            const GrEffectStage& stage = drawState.getStage(s);
792            GrAssert(NULL != stage.getEffect());
793
794            bool explicitLocalCoords =
795                (fDesc.fAttribBindings & GrDrawState::kLocalCoords_AttribBindingsBit);
796            GrDrawEffect drawEffect(stage, explicitLocalCoords);
797            fEffects[s]->setData(fUniformManager, drawEffect);
798            int numSamplers = fUniformHandles.fSamplerUnis[s].count();
799            for (int u = 0; u < numSamplers; ++u) {
800                UniformHandle handle = fUniformHandles.fSamplerUnis[s][u];
801                if (GrGLUniformManager::kInvalidUniformHandle != handle) {
802                    const GrTextureAccess& access = (*stage.getEffect())->textureAccess(u);
803                    GrGLTexture* texture = static_cast<GrGLTexture*>(access.getTexture());
804                    gpu->bindTexture(texUnitIdx, access.getParams(), texture);
805                    ++texUnitIdx;
806                }
807            }
808        }
809    }
810}
811
812void GrGLProgram::setColor(const GrDrawState& drawState,
813                           GrColor color,
814                           SharedGLState* sharedState) {
815    if (!(drawState.getAttribBindings() & GrDrawState::kColor_AttribBindingsBit)) {
816        switch (fDesc.fColorInput) {
817            case GrGLProgramDesc::kAttribute_ColorInput:
818                if (sharedState->fConstAttribColor != color) {
819                    // OpenGL ES only supports the float varieties of glVertexAttrib
820                    GrGLfloat c[4];
821                    GrColorToRGBAFloat(color, c);
822                    GL_CALL(VertexAttrib4fv(fDesc.fColorAttributeIndex, c));
823                    sharedState->fConstAttribColor = color;
824                }
825                break;
826            case GrGLProgramDesc::kUniform_ColorInput:
827                if (fColor != color) {
828                    // OpenGL ES doesn't support unsigned byte varieties of glUniform
829                    GrGLfloat c[4];
830                    GrColorToRGBAFloat(color, c);
831                    GrAssert(GrGLUniformManager::kInvalidUniformHandle !=
832                             fUniformHandles.fColorUni);
833                    fUniformManager.set4fv(fUniformHandles.fColorUni, 0, 1, c);
834                    fColor = color;
835                }
836                break;
837            case GrGLProgramDesc::kSolidWhite_ColorInput:
838            case GrGLProgramDesc::kTransBlack_ColorInput:
839                break;
840            default:
841                GrCrash("Unknown color type.");
842        }
843    }
844}
845
846void GrGLProgram::setCoverage(const GrDrawState& drawState,
847                              GrColor coverage,
848                              SharedGLState* sharedState) {
849    if (!(drawState.getAttribBindings() & GrDrawState::kCoverage_AttribBindingsBit)) {
850        switch (fDesc.fCoverageInput) {
851            case GrGLProgramDesc::kAttribute_ColorInput:
852                if (sharedState->fConstAttribCoverage != coverage) {
853                    // OpenGL ES only supports the float varieties of  glVertexAttrib
854                    GrGLfloat c[4];
855                    GrColorToRGBAFloat(coverage, c);
856                    GL_CALL(VertexAttrib4fv(fDesc.fCoverageAttributeIndex, c));
857                    sharedState->fConstAttribCoverage = coverage;
858                }
859                break;
860            case GrGLProgramDesc::kUniform_ColorInput:
861                if (fCoverage != coverage) {
862                    // OpenGL ES doesn't support unsigned byte varieties of glUniform
863                    GrGLfloat c[4];
864                    GrColorToRGBAFloat(coverage, c);
865                    GrAssert(GrGLUniformManager::kInvalidUniformHandle !=
866                             fUniformHandles.fCoverageUni);
867                    fUniformManager.set4fv(fUniformHandles.fCoverageUni, 0, 1, c);
868                    fCoverage = coverage;
869                }
870                break;
871            case GrGLProgramDesc::kSolidWhite_ColorInput:
872            case GrGLProgramDesc::kTransBlack_ColorInput:
873                break;
874            default:
875                GrCrash("Unknown coverage type.");
876        }
877    }
878}
879
880void GrGLProgram::setMatrixAndRenderTargetHeight(const GrDrawState& drawState) {
881    const GrRenderTarget* rt = drawState.getRenderTarget();
882    SkISize size;
883    size.set(rt->width(), rt->height());
884
885    // Load the RT height uniform if it is needed to y-flip gl_FragCoord.
886    if (GrGLUniformManager::kInvalidUniformHandle != fUniformHandles.fRTHeightUni &&
887        fMatrixState.fRenderTargetSize.fHeight != size.fHeight) {
888        fUniformManager.set1f(fUniformHandles.fRTHeightUni, SkIntToScalar(size.fHeight));
889    }
890
891    if (fMatrixState.fRenderTargetOrigin != rt->origin() ||
892        !fMatrixState.fViewMatrix.cheapEqualTo(drawState.getViewMatrix()) ||
893        fMatrixState.fRenderTargetSize != size) {
894        SkMatrix m;
895        if (kBottomLeft_GrSurfaceOrigin == rt->origin()) {
896            m.setAll(
897                SkIntToScalar(2) / size.fWidth, 0, -SK_Scalar1,
898                0,-SkIntToScalar(2) / size.fHeight, SK_Scalar1,
899            0, 0, SkMatrix::I()[8]);
900        } else {
901            m.setAll(
902                SkIntToScalar(2) / size.fWidth, 0, -SK_Scalar1,
903                0, SkIntToScalar(2) / size.fHeight,-SK_Scalar1,
904            0, 0, SkMatrix::I()[8]);
905        }
906        m.setConcat(m, drawState.getViewMatrix());
907
908        // ES doesn't allow you to pass true to the transpose param so we do our own transpose.
909        GrGLfloat mt[]  = {
910            SkScalarToFloat(m[SkMatrix::kMScaleX]),
911            SkScalarToFloat(m[SkMatrix::kMSkewY]),
912            SkScalarToFloat(m[SkMatrix::kMPersp0]),
913            SkScalarToFloat(m[SkMatrix::kMSkewX]),
914            SkScalarToFloat(m[SkMatrix::kMScaleY]),
915            SkScalarToFloat(m[SkMatrix::kMPersp1]),
916            SkScalarToFloat(m[SkMatrix::kMTransX]),
917            SkScalarToFloat(m[SkMatrix::kMTransY]),
918            SkScalarToFloat(m[SkMatrix::kMPersp2])
919        };
920        fUniformManager.setMatrix3f(fUniformHandles.fViewMatrixUni, mt);
921        fMatrixState.fViewMatrix = drawState.getViewMatrix();
922        fMatrixState.fRenderTargetSize = size;
923        fMatrixState.fRenderTargetOrigin = rt->origin();
924    }
925}
926