GLES11RenderEngine.cpp revision 458197de008be8fe561286b09f4edddb2f5c540a 
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 <utils/String8.h>
21#include <cutils/compiler.h>
22
23#include "GLES11RenderEngine.h"
24#include "Mesh.h"
25
26// ---------------------------------------------------------------------------
27namespace android {
28// ---------------------------------------------------------------------------
29
30GLES11RenderEngine::GLES11RenderEngine() {
31
32    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
33    glGetIntegerv(GL_MAX_VIEWPORT_DIMS, mMaxViewportDims);
34
35    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
36    glPixelStorei(GL_PACK_ALIGNMENT, 4);
37    glEnableClientState(GL_VERTEX_ARRAY);
38    glShadeModel(GL_FLAT);
39    glDisable(GL_DITHER);
40    glDisable(GL_CULL_FACE);
41
42    struct pack565 {
43        inline uint16_t operator() (int r, int g, int b) const {
44            return (r<<11)|(g<<5)|b;
45        }
46    } pack565;
47
48    const uint16_t protTexData[] = { pack565(0x03, 0x03, 0x03) };
49    glGenTextures(1, &mProtectedTexName);
50    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
51    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
52    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
53    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
54    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
55    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1, 1, 0,
56            GL_RGB, GL_UNSIGNED_SHORT_5_6_5, protTexData);
57}
58
59GLES11RenderEngine::~GLES11RenderEngine() {
60}
61
62
63size_t GLES11RenderEngine::getMaxTextureSize() const {
64    return mMaxTextureSize;
65}
66
67size_t GLES11RenderEngine::getMaxViewportDims() const {
68    return
69        mMaxViewportDims[0] < mMaxViewportDims[1] ?
70            mMaxViewportDims[0] : mMaxViewportDims[1];
71}
72
73void GLES11RenderEngine::setViewportAndProjection(
74        size_t vpw, size_t vph, size_t w, size_t h, bool yswap) {
75    glViewport(0, 0, vpw, vph);
76    glMatrixMode(GL_PROJECTION);
77    glLoadIdentity();
78    // put the origin in the left-bottom corner
79    if (yswap)  glOrthof(0, w, h, 0, 0, 1);
80    else        glOrthof(0, w, 0, h, 0, 1);
81    glMatrixMode(GL_MODELVIEW);
82}
83
84void GLES11RenderEngine::setupLayerBlending(
85    bool premultipliedAlpha, bool opaque, int alpha) {
86    GLenum combineRGB;
87    GLenum combineAlpha;
88    GLenum src0Alpha;
89    GLfloat envColor[4];
90
91    if (CC_UNLIKELY(alpha < 0xFF)) {
92        // Cv = premultiplied ? Cs*alpha : Cs
93        // Av = !opaque       ? As*alpha : As
94        combineRGB   = premultipliedAlpha ? GL_MODULATE : GL_REPLACE;
95        combineAlpha = !opaque            ? GL_MODULATE : GL_REPLACE;
96        src0Alpha    = GL_CONSTANT;
97        envColor[0]  = alpha * (1.0f / 255.0f);
98    } else {
99        // Cv = Cs
100        // Av = opaque ? 1.0 : As
101        combineRGB   = GL_REPLACE;
102        combineAlpha = GL_REPLACE;
103        src0Alpha    = opaque ? GL_CONSTANT : GL_TEXTURE;
104        envColor[0]  = 1.0f;
105    }
106
107    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
108    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, combineRGB);
109    glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_RGB, GL_TEXTURE);
110    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
111    if (combineRGB == GL_MODULATE) {
112        glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_RGB, GL_CONSTANT);
113        glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
114    }
115    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, combineAlpha);
116    glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_ALPHA, src0Alpha);
117    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
118    if (combineAlpha == GL_MODULATE) {
119        glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_ALPHA, GL_TEXTURE);
120        glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);
121    }
122    if (combineRGB == GL_MODULATE || src0Alpha == GL_CONSTANT) {
123        envColor[1] = envColor[0];
124        envColor[2] = envColor[0];
125        envColor[3] = envColor[0];
126        glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, envColor);
127    }
128
129    if (alpha < 0xFF || !opaque) {
130        glEnable(GL_BLEND);
131        glBlendFunc(premultipliedAlpha ? GL_ONE : GL_SRC_ALPHA,
132                    GL_ONE_MINUS_SRC_ALPHA);
133    } else {
134        glDisable(GL_BLEND);
135    }
136}
137
138void GLES11RenderEngine::setupDimLayerBlending(int alpha) {
139    glDisable(GL_TEXTURE_EXTERNAL_OES);
140    glDisable(GL_TEXTURE_2D);
141    if (alpha == 0xFF) {
142        glDisable(GL_BLEND);
143    } else {
144        glEnable(GL_BLEND);
145        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
146    }
147    glColor4f(0, 0, 0, alpha/255.0f);
148}
149
150void GLES11RenderEngine::setupLayerTexturing(size_t textureName,
151    bool useFiltering, const float* textureMatrix) {
152    glBindTexture(GL_TEXTURE_EXTERNAL_OES, textureName);
153    GLenum filter = GL_NEAREST;
154    if (useFiltering) {
155        filter = GL_LINEAR;
156    }
157    glTexParameterx(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
158    glTexParameterx(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
159    glTexParameterx(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_MAG_FILTER, filter);
160    glTexParameterx(GL_TEXTURE_EXTERNAL_OES, GL_TEXTURE_MIN_FILTER, filter);
161    glMatrixMode(GL_TEXTURE);
162    glLoadMatrixf(textureMatrix);
163    glMatrixMode(GL_MODELVIEW);
164    glDisable(GL_TEXTURE_2D);
165    glEnable(GL_TEXTURE_EXTERNAL_OES);
166}
167
168void GLES11RenderEngine::setupLayerBlackedOut() {
169    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
170    glMatrixMode(GL_TEXTURE);
171    glLoadIdentity();
172    glMatrixMode(GL_MODELVIEW);
173    glDisable(GL_TEXTURE_EXTERNAL_OES);
174    glEnable(GL_TEXTURE_2D);
175}
176
177void GLES11RenderEngine::disableTexturing() {
178    glDisable(GL_TEXTURE_EXTERNAL_OES);
179    glDisable(GL_TEXTURE_2D);
180}
181
182void GLES11RenderEngine::disableBlending() {
183    glDisable(GL_BLEND);
184}
185
186void GLES11RenderEngine::bindImageAsFramebuffer(EGLImageKHR image,
187        uint32_t* texName, uint32_t* fbName, uint32_t* status) {
188    GLuint tname, name;
189    // turn our EGLImage into a texture
190    glGenTextures(1, &tname);
191    glBindTexture(GL_TEXTURE_2D, tname);
192    glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
193
194    // create a Framebuffer Object to render into
195    glGenFramebuffersOES(1, &name);
196    glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
197    glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES,
198            GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, tname, 0);
199
200    *status = glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);
201    *texName = tname;
202    *fbName = name;
203}
204
205void GLES11RenderEngine::unbindFramebuffer(uint32_t texName, uint32_t fbName) {
206    glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
207    glDeleteFramebuffersOES(1, &fbName);
208    glDeleteTextures(1, &texName);
209}
210
211void GLES11RenderEngine::fillWithColor(const Mesh& mesh, float r, float g, float b, float a) {
212    glColor4f(r, g, b, a);
213    glDisable(GL_TEXTURE_EXTERNAL_OES);
214    glDisable(GL_TEXTURE_2D);
215    glDisable(GL_BLEND);
216
217    glVertexPointer(mesh.getVertexSize(),
218            GL_FLOAT,
219            mesh.getByteStride(),
220            mesh.getPositions());
221
222    glDrawArrays(mesh.getPrimitive(), 0, mesh.getVertexCount());
223}
224
225void GLES11RenderEngine::drawMesh(const Mesh& mesh) {
226    if (mesh.getTexCoordsSize()) {
227        glEnableClientState(GL_TEXTURE_COORD_ARRAY);
228        glTexCoordPointer(mesh.getTexCoordsSize(),
229                GL_FLOAT,
230                mesh.getByteStride(),
231                mesh.getTexCoords());
232    }
233
234    glVertexPointer(mesh.getVertexSize(),
235            GL_FLOAT,
236            mesh.getByteStride(),
237            mesh.getPositions());
238
239    glDrawArrays(mesh.getPrimitive(), 0, mesh.getVertexCount());
240
241    if (mesh.getTexCoordsSize()) {
242        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
243    }
244}
245
246void GLES11RenderEngine::dump(String8& result) {
247    RenderEngine::dump(result);
248}
249
250// ---------------------------------------------------------------------------
251}; // namespace android
252// ---------------------------------------------------------------------------
253
254#if defined(__gl2_h_)
255#error "don't include gl2/gl2.h in this file"
256#endif
257