1/*
2 * Copyright 2013 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#include <GLES/gl.h>
18#include <GLES/glext.h>
19
20#include <ui/Rect.h>
21
22#include <utils/String8.h>
23#include <cutils/compiler.h>
24#include <gui/ISurfaceComposer.h>
25
26#include "GLES11RenderEngine.h"
27#include "Mesh.h"
28#include "Texture.h"
29
30// ---------------------------------------------------------------------------
31namespace android {
32// ---------------------------------------------------------------------------
33
34GLES11RenderEngine::GLES11RenderEngine() {
35
36    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
37    glGetIntegerv(GL_MAX_VIEWPORT_DIMS, mMaxViewportDims);
38
39    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
40    glPixelStorei(GL_PACK_ALIGNMENT, 4);
41    glEnableClientState(GL_VERTEX_ARRAY);
42    glShadeModel(GL_FLAT);
43    glDisable(GL_DITHER);
44    glDisable(GL_CULL_FACE);
45
46    const uint16_t protTexData[] = { 0 };
47    glGenTextures(1, &mProtectedTexName);
48    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
49    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
50    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
51    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
52    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
53    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1, 1, 0,
54            GL_RGB, GL_UNSIGNED_SHORT_5_6_5, protTexData);
55}
56
57GLES11RenderEngine::~GLES11RenderEngine() {
58}
59
60
61size_t GLES11RenderEngine::getMaxTextureSize() const {
62    return mMaxTextureSize;
63}
64
65size_t GLES11RenderEngine::getMaxViewportDims() const {
66    return
67        mMaxViewportDims[0] < mMaxViewportDims[1] ?
68            mMaxViewportDims[0] : mMaxViewportDims[1];
69}
70
71void GLES11RenderEngine::setViewportAndProjection(
72        size_t vpw, size_t vph, Rect sourceCrop, size_t hwh, bool yswap,
73        Transform::orientation_flags rotation) {
74    glViewport(0, 0, vpw, vph);
75    glMatrixMode(GL_PROJECTION);
76    glLoadIdentity();
77
78    size_t l = sourceCrop.left;
79    size_t r = sourceCrop.right;
80
81    // In GL, (0, 0) is the bottom-left corner, so flip y coordinates
82    size_t t = hwh - sourceCrop.top;
83    size_t b = hwh - sourceCrop.bottom;
84
85    if (yswap) {
86        glOrthof(l, r, t, b, 0, 1);
87    } else {
88        glOrthof(l, r, b, t, 0, 1);
89    }
90
91    switch (rotation) {
92        case Transform::ROT_0:
93            break;
94        case Transform::ROT_90:
95            glRotatef(90, 0, 0, 1);
96            break;
97        case Transform::ROT_180:
98            glRotatef(180, 0, 0, 1);
99            break;
100        case Transform::ROT_270:
101            glRotatef(270, 0, 0, 1);
102            break;
103        default:
104            break;
105    }
106
107    glMatrixMode(GL_MODELVIEW);
108}
109
110#ifdef USE_HWC2
111void GLES11RenderEngine::setupLayerBlending(bool premultipliedAlpha,
112        bool opaque, float alpha) {
113#else
114void GLES11RenderEngine::setupLayerBlending(
115    bool premultipliedAlpha, bool opaque, int alpha) {
116#endif
117    GLenum combineRGB;
118    GLenum combineAlpha;
119    GLenum src0Alpha;
120    GLfloat envColor[4];
121
122#ifdef USE_HWC2
123    if (CC_UNLIKELY(alpha < 1.0f)) {
124#else
125    if (CC_UNLIKELY(alpha < 0xFF)) {
126#endif
127        // Cv = premultiplied ? Cs*alpha : Cs
128        // Av = !opaque       ? As*alpha : As
129        combineRGB   = premultipliedAlpha ? GL_MODULATE : GL_REPLACE;
130        combineAlpha = !opaque            ? GL_MODULATE : GL_REPLACE;
131        src0Alpha    = GL_CONSTANT;
132#ifdef USE_HWC2
133        envColor[0]  = alpha;
134#else
135        envColor[0]  = alpha * (1.0f / 255.0f);
136#endif
137    } else {
138        // Cv = Cs
139        // Av = opaque ? 1.0 : As
140        combineRGB   = GL_REPLACE;
141        combineAlpha = GL_REPLACE;
142        src0Alpha    = opaque ? GL_CONSTANT : GL_TEXTURE;
143        envColor[0]  = 1.0f;
144    }
145
146    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
147    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, combineRGB);
148    glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_RGB, GL_TEXTURE);
149    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
150    if (combineRGB == GL_MODULATE) {
151        glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_RGB, GL_CONSTANT);
152        glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
153    }
154    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, combineAlpha);
155    glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_ALPHA, src0Alpha);
156    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
157    if (combineAlpha == GL_MODULATE) {
158        glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_ALPHA, GL_TEXTURE);
159        glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);
160    }
161    if (combineRGB == GL_MODULATE || src0Alpha == GL_CONSTANT) {
162        envColor[1] = envColor[0];
163        envColor[2] = envColor[0];
164        envColor[3] = envColor[0];
165        glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, envColor);
166    }
167
168#ifdef USE_HWC2
169    if (alpha < 1.0f || !opaque) {
170#else
171    if (alpha < 0xFF || !opaque) {
172#endif
173        glEnable(GL_BLEND);
174        glBlendFunc(premultipliedAlpha ? GL_ONE : GL_SRC_ALPHA,
175                    GL_ONE_MINUS_SRC_ALPHA);
176    } else {
177        glDisable(GL_BLEND);
178    }
179}
180
181#ifdef USE_HWC2
182void GLES11RenderEngine::setupDimLayerBlending(float alpha) {
183#else
184void GLES11RenderEngine::setupDimLayerBlending(int alpha) {
185#endif
186    glDisable(GL_TEXTURE_EXTERNAL_OES);
187    glDisable(GL_TEXTURE_2D);
188#ifdef USE_HWC2
189    if (alpha == 1.0f) {
190#else
191    if (alpha == 0xFF) {
192#endif
193        glDisable(GL_BLEND);
194    } else {
195        glEnable(GL_BLEND);
196        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
197    }
198#ifdef USE_HWC2
199    glColor4f(0, 0, 0, alpha);
200#else
201    glColor4f(0, 0, 0, alpha/255.0f);
202#endif
203}
204
205void GLES11RenderEngine::setupLayerTexturing(const Texture& texture) {
206    GLuint target = texture.getTextureTarget();
207    glBindTexture(target, texture.getTextureName());
208    GLenum filter = GL_NEAREST;
209    if (texture.getFiltering()) {
210        filter = GL_LINEAR;
211    }
212    glTexParameterx(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
213    glTexParameterx(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
214    glTexParameterx(target, GL_TEXTURE_MAG_FILTER, filter);
215    glTexParameterx(target, GL_TEXTURE_MIN_FILTER, filter);
216    glMatrixMode(GL_TEXTURE);
217    glLoadMatrixf(texture.getMatrix().asArray());
218    glMatrixMode(GL_MODELVIEW);
219    glDisable(GL_TEXTURE_2D);
220    glEnable(GL_TEXTURE_EXTERNAL_OES);
221}
222
223void GLES11RenderEngine::setupLayerBlackedOut() {
224    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
225    glMatrixMode(GL_TEXTURE);
226    glLoadIdentity();
227    glMatrixMode(GL_MODELVIEW);
228    glDisable(GL_TEXTURE_EXTERNAL_OES);
229    glEnable(GL_TEXTURE_2D);
230}
231
232void GLES11RenderEngine::disableTexturing() {
233    glDisable(GL_TEXTURE_EXTERNAL_OES);
234    glDisable(GL_TEXTURE_2D);
235}
236
237void GLES11RenderEngine::disableBlending() {
238    glDisable(GL_BLEND);
239}
240
241void GLES11RenderEngine::bindImageAsFramebuffer(EGLImageKHR image,
242        uint32_t* texName, uint32_t* fbName, uint32_t* status) {
243    GLuint tname, name;
244    // turn our EGLImage into a texture
245    glGenTextures(1, &tname);
246    glBindTexture(GL_TEXTURE_2D, tname);
247    glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
248
249    // create a Framebuffer Object to render into
250    glGenFramebuffersOES(1, &name);
251    glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
252    glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES,
253            GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, tname, 0);
254
255    *status = glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);
256    *texName = tname;
257    *fbName = name;
258}
259
260void GLES11RenderEngine::unbindFramebuffer(uint32_t texName, uint32_t fbName) {
261    glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
262    glDeleteFramebuffersOES(1, &fbName);
263    glDeleteTextures(1, &texName);
264}
265
266void GLES11RenderEngine::setupFillWithColor(float r, float g, float b, float a) {
267    glColor4f(r, g, b, a);
268    glDisable(GL_TEXTURE_EXTERNAL_OES);
269    glDisable(GL_TEXTURE_2D);
270    glDisable(GL_BLEND);
271}
272
273void GLES11RenderEngine::drawMesh(const Mesh& mesh) {
274    if (mesh.getTexCoordsSize()) {
275        glEnableClientState(GL_TEXTURE_COORD_ARRAY);
276        glTexCoordPointer(mesh.getTexCoordsSize(),
277                GL_FLOAT,
278                mesh.getByteStride(),
279                mesh.getTexCoords());
280    }
281
282    glVertexPointer(mesh.getVertexSize(),
283            GL_FLOAT,
284            mesh.getByteStride(),
285            mesh.getPositions());
286
287    glDrawArrays(mesh.getPrimitive(), 0, mesh.getVertexCount());
288
289    if (mesh.getTexCoordsSize()) {
290        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
291    }
292}
293
294void GLES11RenderEngine::dump(String8& result) {
295    RenderEngine::dump(result);
296}
297
298// ---------------------------------------------------------------------------
299}; // namespace android
300// ---------------------------------------------------------------------------
301
302#if defined(__gl2_h_)
303#error "don't include gl2/gl2.h in this file"
304#endif
305