GLES11RenderEngine.cpp revision 89fd4f7fa6bd17ce5400979c3b9e5ba0bf7e919e 
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
110void GLES11RenderEngine::setupLayerBlending(
111    bool premultipliedAlpha, bool opaque, int alpha) {
112    GLenum combineRGB;
113    GLenum combineAlpha;
114    GLenum src0Alpha;
115    GLfloat envColor[4];
116
117    if (CC_UNLIKELY(alpha < 0xFF)) {
118        // Cv = premultiplied ? Cs*alpha : Cs
119        // Av = !opaque       ? As*alpha : As
120        combineRGB   = premultipliedAlpha ? GL_MODULATE : GL_REPLACE;
121        combineAlpha = !opaque            ? GL_MODULATE : GL_REPLACE;
122        src0Alpha    = GL_CONSTANT;
123        envColor[0]  = alpha * (1.0f / 255.0f);
124    } else {
125        // Cv = Cs
126        // Av = opaque ? 1.0 : As
127        combineRGB   = GL_REPLACE;
128        combineAlpha = GL_REPLACE;
129        src0Alpha    = opaque ? GL_CONSTANT : GL_TEXTURE;
130        envColor[0]  = 1.0f;
131    }
132
133    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
134    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, combineRGB);
135    glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_RGB, GL_TEXTURE);
136    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
137    if (combineRGB == GL_MODULATE) {
138        glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_RGB, GL_CONSTANT);
139        glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
140    }
141    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, combineAlpha);
142    glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_ALPHA, src0Alpha);
143    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
144    if (combineAlpha == GL_MODULATE) {
145        glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_ALPHA, GL_TEXTURE);
146        glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);
147    }
148    if (combineRGB == GL_MODULATE || src0Alpha == GL_CONSTANT) {
149        envColor[1] = envColor[0];
150        envColor[2] = envColor[0];
151        envColor[3] = envColor[0];
152        glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, envColor);
153    }
154
155    if (alpha < 0xFF || !opaque) {
156        glEnable(GL_BLEND);
157        glBlendFunc(premultipliedAlpha ? GL_ONE : GL_SRC_ALPHA,
158                    GL_ONE_MINUS_SRC_ALPHA);
159    } else {
160        glDisable(GL_BLEND);
161    }
162}
163
164void GLES11RenderEngine::setupDimLayerBlending(int alpha) {
165    glDisable(GL_TEXTURE_EXTERNAL_OES);
166    glDisable(GL_TEXTURE_2D);
167    if (alpha == 0xFF) {
168        glDisable(GL_BLEND);
169    } else {
170        glEnable(GL_BLEND);
171        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
172    }
173    glColor4f(0, 0, 0, alpha/255.0f);
174}
175
176void GLES11RenderEngine::setupLayerTexturing(const Texture& texture) {
177    GLuint target = texture.getTextureTarget();
178    glBindTexture(target, texture.getTextureName());
179    GLenum filter = GL_NEAREST;
180    if (texture.getFiltering()) {
181        filter = GL_LINEAR;
182    }
183    glTexParameterx(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
184    glTexParameterx(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
185    glTexParameterx(target, GL_TEXTURE_MAG_FILTER, filter);
186    glTexParameterx(target, GL_TEXTURE_MIN_FILTER, filter);
187    glMatrixMode(GL_TEXTURE);
188    glLoadMatrixf(texture.getMatrix().asArray());
189    glMatrixMode(GL_MODELVIEW);
190    glDisable(GL_TEXTURE_2D);
191    glEnable(GL_TEXTURE_EXTERNAL_OES);
192}
193
194void GLES11RenderEngine::setupLayerBlackedOut() {
195    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
196    glMatrixMode(GL_TEXTURE);
197    glLoadIdentity();
198    glMatrixMode(GL_MODELVIEW);
199    glDisable(GL_TEXTURE_EXTERNAL_OES);
200    glEnable(GL_TEXTURE_2D);
201}
202
203void GLES11RenderEngine::disableTexturing() {
204    glDisable(GL_TEXTURE_EXTERNAL_OES);
205    glDisable(GL_TEXTURE_2D);
206}
207
208void GLES11RenderEngine::disableBlending() {
209    glDisable(GL_BLEND);
210}
211
212void GLES11RenderEngine::bindImageAsFramebuffer(EGLImageKHR image,
213        uint32_t* texName, uint32_t* fbName, uint32_t* status) {
214    GLuint tname, name;
215    // turn our EGLImage into a texture
216    glGenTextures(1, &tname);
217    glBindTexture(GL_TEXTURE_2D, tname);
218    glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
219
220    // create a Framebuffer Object to render into
221    glGenFramebuffersOES(1, &name);
222    glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
223    glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES,
224            GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, tname, 0);
225
226    *status = glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);
227    *texName = tname;
228    *fbName = name;
229}
230
231void GLES11RenderEngine::unbindFramebuffer(uint32_t texName, uint32_t fbName) {
232    glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
233    glDeleteFramebuffersOES(1, &fbName);
234    glDeleteTextures(1, &texName);
235}
236
237void GLES11RenderEngine::setupFillWithColor(float r, float g, float b, float a) {
238    glColor4f(r, g, b, a);
239    glDisable(GL_TEXTURE_EXTERNAL_OES);
240    glDisable(GL_TEXTURE_2D);
241    glDisable(GL_BLEND);
242}
243
244void GLES11RenderEngine::drawMesh(const Mesh& mesh) {
245    if (mesh.getTexCoordsSize()) {
246        glEnableClientState(GL_TEXTURE_COORD_ARRAY);
247        glTexCoordPointer(mesh.getTexCoordsSize(),
248                GL_FLOAT,
249                mesh.getByteStride(),
250                mesh.getTexCoords());
251    }
252
253    glVertexPointer(mesh.getVertexSize(),
254            GL_FLOAT,
255            mesh.getByteStride(),
256            mesh.getPositions());
257
258    glDrawArrays(mesh.getPrimitive(), 0, mesh.getVertexCount());
259
260    if (mesh.getTexCoordsSize()) {
261        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
262    }
263}
264
265void GLES11RenderEngine::beginGroup(const mat4& /*colorTransform*/) {
266    // doesn't do anything in GLES 1.1
267}
268
269void GLES11RenderEngine::endGroup() {
270    // doesn't do anything in GLES 1.1
271}
272
273void GLES11RenderEngine::dump(String8& result) {
274    RenderEngine::dump(result);
275}
276
277// ---------------------------------------------------------------------------
278}; // namespace android
279// ---------------------------------------------------------------------------
280
281#if defined(__gl2_h_)
282#error "don't include gl2/gl2.h in this file"
283#endif
284