GLES11RenderEngine.cpp revision c18790018be5d7ea7061ccbc81f3044e74adc823 
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
25#include "GLES11RenderEngine.h"
26#include "Mesh.h"
27#include "Texture.h"
28
29// ---------------------------------------------------------------------------
30namespace android {
31// ---------------------------------------------------------------------------
32
33GLES11RenderEngine::GLES11RenderEngine() {
34
35    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
36    glGetIntegerv(GL_MAX_VIEWPORT_DIMS, mMaxViewportDims);
37
38    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
39    glPixelStorei(GL_PACK_ALIGNMENT, 4);
40    glEnableClientState(GL_VERTEX_ARRAY);
41    glShadeModel(GL_FLAT);
42    glDisable(GL_DITHER);
43    glDisable(GL_CULL_FACE);
44
45    struct pack565 {
46        inline uint16_t operator() (int r, int g, int b) const {
47            return (r<<11)|(g<<5)|b;
48        }
49    } pack565;
50
51    const uint16_t protTexData[] = { 0 };
52    glGenTextures(1, &mProtectedTexName);
53    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
54    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
55    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
56    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
57    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
58    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1, 1, 0,
59            GL_RGB, GL_UNSIGNED_SHORT_5_6_5, protTexData);
60}
61
62GLES11RenderEngine::~GLES11RenderEngine() {
63}
64
65
66size_t GLES11RenderEngine::getMaxTextureSize() const {
67    return mMaxTextureSize;
68}
69
70size_t GLES11RenderEngine::getMaxViewportDims() const {
71    return
72        mMaxViewportDims[0] < mMaxViewportDims[1] ?
73            mMaxViewportDims[0] : mMaxViewportDims[1];
74}
75
76void GLES11RenderEngine::setViewportAndProjection(
77        size_t vpw, size_t vph, Rect sourceCrop, size_t hwh, bool yswap) {
78    glViewport(0, 0, vpw, vph);
79    glMatrixMode(GL_PROJECTION);
80    glLoadIdentity();
81
82    size_t l = sourceCrop.left;
83    size_t r = sourceCrop.right;
84
85    // In GL, (0, 0) is the bottom-left corner, so flip y coordinates
86    size_t t = hwh - sourceCrop.top;
87    size_t b = hwh - sourceCrop.bottom;
88
89    if (yswap) {
90        glOrthof(l, r, t, b, 0, 1);
91    } else {
92        glOrthof(l, r, b, t, 0, 1);
93    }
94    glMatrixMode(GL_MODELVIEW);
95}
96
97void GLES11RenderEngine::setupLayerBlending(
98    bool premultipliedAlpha, bool opaque, int alpha) {
99    GLenum combineRGB;
100    GLenum combineAlpha;
101    GLenum src0Alpha;
102    GLfloat envColor[4];
103
104    if (CC_UNLIKELY(alpha < 0xFF)) {
105        // Cv = premultiplied ? Cs*alpha : Cs
106        // Av = !opaque       ? As*alpha : As
107        combineRGB   = premultipliedAlpha ? GL_MODULATE : GL_REPLACE;
108        combineAlpha = !opaque            ? GL_MODULATE : GL_REPLACE;
109        src0Alpha    = GL_CONSTANT;
110        envColor[0]  = alpha * (1.0f / 255.0f);
111    } else {
112        // Cv = Cs
113        // Av = opaque ? 1.0 : As
114        combineRGB   = GL_REPLACE;
115        combineAlpha = GL_REPLACE;
116        src0Alpha    = opaque ? GL_CONSTANT : GL_TEXTURE;
117        envColor[0]  = 1.0f;
118    }
119
120    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
121    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, combineRGB);
122    glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_RGB, GL_TEXTURE);
123    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
124    if (combineRGB == GL_MODULATE) {
125        glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_RGB, GL_CONSTANT);
126        glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
127    }
128    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, combineAlpha);
129    glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_ALPHA, src0Alpha);
130    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
131    if (combineAlpha == GL_MODULATE) {
132        glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_ALPHA, GL_TEXTURE);
133        glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);
134    }
135    if (combineRGB == GL_MODULATE || src0Alpha == GL_CONSTANT) {
136        envColor[1] = envColor[0];
137        envColor[2] = envColor[0];
138        envColor[3] = envColor[0];
139        glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, envColor);
140    }
141
142    if (alpha < 0xFF || !opaque) {
143        glEnable(GL_BLEND);
144        glBlendFunc(premultipliedAlpha ? GL_ONE : GL_SRC_ALPHA,
145                    GL_ONE_MINUS_SRC_ALPHA);
146    } else {
147        glDisable(GL_BLEND);
148    }
149}
150
151void GLES11RenderEngine::setupDimLayerBlending(int alpha) {
152    glDisable(GL_TEXTURE_EXTERNAL_OES);
153    glDisable(GL_TEXTURE_2D);
154    if (alpha == 0xFF) {
155        glDisable(GL_BLEND);
156    } else {
157        glEnable(GL_BLEND);
158        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
159    }
160    glColor4f(0, 0, 0, alpha/255.0f);
161}
162
163void GLES11RenderEngine::setupLayerTexturing(const Texture& texture) {
164    GLuint target = texture.getTextureTarget();
165    glBindTexture(target, texture.getTextureName());
166    GLenum filter = GL_NEAREST;
167    if (texture.getFiltering()) {
168        filter = GL_LINEAR;
169    }
170    glTexParameterx(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
171    glTexParameterx(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
172    glTexParameterx(target, GL_TEXTURE_MAG_FILTER, filter);
173    glTexParameterx(target, GL_TEXTURE_MIN_FILTER, filter);
174    glMatrixMode(GL_TEXTURE);
175    glLoadMatrixf(texture.getMatrix().asArray());
176    glMatrixMode(GL_MODELVIEW);
177    glDisable(GL_TEXTURE_2D);
178    glEnable(GL_TEXTURE_EXTERNAL_OES);
179}
180
181void GLES11RenderEngine::setupLayerBlackedOut() {
182    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
183    glMatrixMode(GL_TEXTURE);
184    glLoadIdentity();
185    glMatrixMode(GL_MODELVIEW);
186    glDisable(GL_TEXTURE_EXTERNAL_OES);
187    glEnable(GL_TEXTURE_2D);
188}
189
190void GLES11RenderEngine::disableTexturing() {
191    glDisable(GL_TEXTURE_EXTERNAL_OES);
192    glDisable(GL_TEXTURE_2D);
193}
194
195void GLES11RenderEngine::disableBlending() {
196    glDisable(GL_BLEND);
197}
198
199void GLES11RenderEngine::bindImageAsFramebuffer(EGLImageKHR image,
200        uint32_t* texName, uint32_t* fbName, uint32_t* status) {
201    GLuint tname, name;
202    // turn our EGLImage into a texture
203    glGenTextures(1, &tname);
204    glBindTexture(GL_TEXTURE_2D, tname);
205    glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
206
207    // create a Framebuffer Object to render into
208    glGenFramebuffersOES(1, &name);
209    glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
210    glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES,
211            GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, tname, 0);
212
213    *status = glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);
214    *texName = tname;
215    *fbName = name;
216}
217
218void GLES11RenderEngine::unbindFramebuffer(uint32_t texName, uint32_t fbName) {
219    glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
220    glDeleteFramebuffersOES(1, &fbName);
221    glDeleteTextures(1, &texName);
222}
223
224void GLES11RenderEngine::setupFillWithColor(float r, float g, float b, float a) {
225    glColor4f(r, g, b, a);
226    glDisable(GL_TEXTURE_EXTERNAL_OES);
227    glDisable(GL_TEXTURE_2D);
228    glDisable(GL_BLEND);
229}
230
231void GLES11RenderEngine::drawMesh(const Mesh& mesh) {
232    if (mesh.getTexCoordsSize()) {
233        glEnableClientState(GL_TEXTURE_COORD_ARRAY);
234        glTexCoordPointer(mesh.getTexCoordsSize(),
235                GL_FLOAT,
236                mesh.getByteStride(),
237                mesh.getTexCoords());
238    }
239
240    glVertexPointer(mesh.getVertexSize(),
241            GL_FLOAT,
242            mesh.getByteStride(),
243            mesh.getPositions());
244
245    glDrawArrays(mesh.getPrimitive(), 0, mesh.getVertexCount());
246
247    if (mesh.getTexCoordsSize()) {
248        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
249    }
250}
251
252void GLES11RenderEngine::beginGroup(const mat4& /*colorTransform*/) {
253    // doesn't do anything in GLES 1.1
254}
255
256void GLES11RenderEngine::endGroup() {
257    // doesn't do anything in GLES 1.1
258}
259
260void GLES11RenderEngine::dump(String8& result) {
261    RenderEngine::dump(result);
262}
263
264// ---------------------------------------------------------------------------
265}; // namespace android
266// ---------------------------------------------------------------------------
267
268#if defined(__gl2_h_)
269#error "don't include gl2/gl2.h in this file"
270#endif
271