GLES20RenderEngine.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#define ATRACE_TAG ATRACE_TAG_GRAPHICS
18
19#include <GLES2/gl2.h>
20#include <GLES2/gl2ext.h>
21
22#include <ui/Rect.h>
23
24#include <utils/String8.h>
25#include <utils/Trace.h>
26
27#include <cutils/compiler.h>
28
29#include "GLES20RenderEngine.h"
30#include "Program.h"
31#include "ProgramCache.h"
32#include "Description.h"
33#include "Mesh.h"
34#include "Texture.h"
35
36// ---------------------------------------------------------------------------
37namespace android {
38// ---------------------------------------------------------------------------
39
40GLES20RenderEngine::GLES20RenderEngine() :
41        mVpWidth(0), mVpHeight(0) {
42
43    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
44    glGetIntegerv(GL_MAX_VIEWPORT_DIMS, mMaxViewportDims);
45
46    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
47    glPixelStorei(GL_PACK_ALIGNMENT, 4);
48
49    struct pack565 {
50        inline uint16_t operator() (int r, int g, int b) const {
51            return (r<<11)|(g<<5)|b;
52        }
53    } pack565;
54
55    const uint16_t protTexData[] = { 0 };
56    glGenTextures(1, &mProtectedTexName);
57    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
58    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
59    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
60    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
61    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
62    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1, 1, 0,
63            GL_RGB, GL_UNSIGNED_SHORT_5_6_5, protTexData);
64
65    //mColorBlindnessCorrection = M;
66}
67
68GLES20RenderEngine::~GLES20RenderEngine() {
69}
70
71
72size_t GLES20RenderEngine::getMaxTextureSize() const {
73    return mMaxTextureSize;
74}
75
76size_t GLES20RenderEngine::getMaxViewportDims() const {
77    return
78        mMaxViewportDims[0] < mMaxViewportDims[1] ?
79            mMaxViewportDims[0] : mMaxViewportDims[1];
80}
81
82void GLES20RenderEngine::setViewportAndProjection(
83        size_t vpw, size_t vph, Rect sourceCrop, size_t hwh, bool yswap) {
84
85    size_t l = sourceCrop.left;
86    size_t r = sourceCrop.right;
87
88    // In GL, (0, 0) is the bottom-left corner, so flip y coordinates
89    size_t t = hwh - sourceCrop.top;
90    size_t b = hwh - sourceCrop.bottom;
91
92    mat4 m;
93    if (yswap) {
94        m = mat4::ortho(l, r, t, b, 0, 1);
95    } else {
96        m = mat4::ortho(l, r, b, t, 0, 1);
97    }
98
99    glViewport(0, 0, vpw, vph);
100    mState.setProjectionMatrix(m);
101    mVpWidth = vpw;
102    mVpHeight = vph;
103}
104
105void GLES20RenderEngine::setupLayerBlending(
106    bool premultipliedAlpha, bool opaque, int alpha) {
107
108    mState.setPremultipliedAlpha(premultipliedAlpha);
109    mState.setOpaque(opaque);
110    mState.setPlaneAlpha(alpha / 255.0f);
111
112    if (alpha < 0xFF || !opaque) {
113        glEnable(GL_BLEND);
114        glBlendFunc(premultipliedAlpha ? GL_ONE : GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
115    } else {
116        glDisable(GL_BLEND);
117    }
118}
119
120void GLES20RenderEngine::setupDimLayerBlending(int alpha) {
121    mState.setPlaneAlpha(1.0f);
122    mState.setPremultipliedAlpha(true);
123    mState.setOpaque(false);
124    mState.setColor(0, 0, 0, alpha/255.0f);
125    mState.disableTexture();
126
127    if (alpha == 0xFF) {
128        glDisable(GL_BLEND);
129    } else {
130        glEnable(GL_BLEND);
131        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
132    }
133}
134
135void GLES20RenderEngine::setupLayerTexturing(const Texture& texture) {
136    GLuint target = texture.getTextureTarget();
137    glBindTexture(target, texture.getTextureName());
138    GLenum filter = GL_NEAREST;
139    if (texture.getFiltering()) {
140        filter = GL_LINEAR;
141    }
142    glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
143    glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
144    glTexParameteri(target, GL_TEXTURE_MAG_FILTER, filter);
145    glTexParameteri(target, GL_TEXTURE_MIN_FILTER, filter);
146
147    mState.setTexture(texture);
148}
149
150void GLES20RenderEngine::setupLayerBlackedOut() {
151    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
152    Texture texture(Texture::TEXTURE_2D, mProtectedTexName);
153    texture.setDimensions(1, 1); // FIXME: we should get that from somewhere
154    mState.setTexture(texture);
155}
156
157void GLES20RenderEngine::disableTexturing() {
158    mState.disableTexture();
159}
160
161void GLES20RenderEngine::disableBlending() {
162    glDisable(GL_BLEND);
163}
164
165
166void GLES20RenderEngine::bindImageAsFramebuffer(EGLImageKHR image,
167        uint32_t* texName, uint32_t* fbName, uint32_t* status) {
168    GLuint tname, name;
169    // turn our EGLImage into a texture
170    glGenTextures(1, &tname);
171    glBindTexture(GL_TEXTURE_2D, tname);
172    glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
173
174    // create a Framebuffer Object to render into
175    glGenFramebuffers(1, &name);
176    glBindFramebuffer(GL_FRAMEBUFFER, name);
177    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, tname, 0);
178
179    *status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
180    *texName = tname;
181    *fbName = name;
182}
183
184void GLES20RenderEngine::unbindFramebuffer(uint32_t texName, uint32_t fbName) {
185    glBindFramebuffer(GL_FRAMEBUFFER, 0);
186    glDeleteFramebuffers(1, &fbName);
187    glDeleteTextures(1, &texName);
188}
189
190void GLES20RenderEngine::setupFillWithColor(float r, float g, float b, float a) {
191    mState.setPlaneAlpha(1.0f);
192    mState.setPremultipliedAlpha(true);
193    mState.setOpaque(false);
194    mState.setColor(r, g, b, a);
195    mState.disableTexture();
196    glDisable(GL_BLEND);
197}
198
199void GLES20RenderEngine::drawMesh(const Mesh& mesh) {
200
201    ProgramCache::getInstance().useProgram(mState);
202
203    if (mesh.getTexCoordsSize()) {
204        glEnableVertexAttribArray(Program::texCoords);
205        glVertexAttribPointer(Program::texCoords,
206                mesh.getTexCoordsSize(),
207                GL_FLOAT, GL_FALSE,
208                mesh.getByteStride(),
209                mesh.getTexCoords());
210    }
211
212    glVertexAttribPointer(Program::position,
213            mesh.getVertexSize(),
214            GL_FLOAT, GL_FALSE,
215            mesh.getByteStride(),
216            mesh.getPositions());
217
218    glDrawArrays(mesh.getPrimitive(), 0, mesh.getVertexCount());
219
220    if (mesh.getTexCoordsSize()) {
221        glDisableVertexAttribArray(Program::texCoords);
222    }
223}
224
225void GLES20RenderEngine::beginGroup(const mat4& colorTransform) {
226
227    GLuint tname, name;
228    // create the texture
229    glGenTextures(1, &tname);
230    glBindTexture(GL_TEXTURE_2D, tname);
231    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
232    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
233    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
234    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
235    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, mVpWidth, mVpHeight, 0, GL_RGBA, GL_UNSIGNED_BYTE, 0);
236
237    // create a Framebuffer Object to render into
238    glGenFramebuffers(1, &name);
239    glBindFramebuffer(GL_FRAMEBUFFER, name);
240    glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, tname, 0);
241
242    Group group;
243    group.texture = tname;
244    group.fbo = name;
245    group.width = mVpWidth;
246    group.height = mVpHeight;
247    group.colorTransform = colorTransform;
248
249    mGroupStack.push(group);
250}
251
252void GLES20RenderEngine::endGroup() {
253
254    const Group group(mGroupStack.top());
255    mGroupStack.pop();
256
257    // activate the previous render target
258    GLuint fbo = 0;
259    if (!mGroupStack.isEmpty()) {
260        fbo = mGroupStack.top().fbo;
261    }
262    glBindFramebuffer(GL_FRAMEBUFFER, fbo);
263
264    // set our state
265    Texture texture(Texture::TEXTURE_2D, group.texture);
266    texture.setDimensions(group.width, group.height);
267    glBindTexture(GL_TEXTURE_2D, group.texture);
268
269    mState.setPlaneAlpha(1.0f);
270    mState.setPremultipliedAlpha(true);
271    mState.setOpaque(false);
272    mState.setTexture(texture);
273    mState.setColorMatrix(group.colorTransform);
274    glDisable(GL_BLEND);
275
276    Mesh mesh(Mesh::TRIANGLE_FAN, 4, 2, 2);
277    Mesh::VertexArray<vec2> position(mesh.getPositionArray<vec2>());
278    Mesh::VertexArray<vec2> texCoord(mesh.getTexCoordArray<vec2>());
279    position[0] = vec2(0, 0);
280    position[1] = vec2(group.width, 0);
281    position[2] = vec2(group.width, group.height);
282    position[3] = vec2(0, group.height);
283    texCoord[0] = vec2(0, 0);
284    texCoord[1] = vec2(1, 0);
285    texCoord[2] = vec2(1, 1);
286    texCoord[3] = vec2(0, 1);
287    drawMesh(mesh);
288
289    // reset color matrix
290    mState.setColorMatrix(mat4());
291
292    // free our fbo and texture
293    glDeleteFramebuffers(1, &group.fbo);
294    glDeleteTextures(1, &group.texture);
295}
296
297void GLES20RenderEngine::dump(String8& result) {
298    RenderEngine::dump(result);
299}
300
301// ---------------------------------------------------------------------------
302}; // namespace android
303// ---------------------------------------------------------------------------
304
305#if defined(__gl_h_)
306#error "don't include gl/gl.h in this file"
307#endif
308