GLES20RenderEngine.cpp revision 49457ac092071a8f964f7f69156093657ccdc3d0 
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 <utils/String8.h>
23#include <utils/Trace.h>
24
25#include <cutils/compiler.h>
26
27#include "GLES20RenderEngine.h"
28#include "Program.h"
29#include "ProgramCache.h"
30#include "Description.h"
31#include "Mesh.h"
32#include "Texture.h"
33
34// ---------------------------------------------------------------------------
35namespace android {
36// ---------------------------------------------------------------------------
37
38GLES20RenderEngine::GLES20RenderEngine() {
39
40    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
41    glGetIntegerv(GL_MAX_VIEWPORT_DIMS, mMaxViewportDims);
42
43    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
44    glPixelStorei(GL_PACK_ALIGNMENT, 4);
45
46    struct pack565 {
47        inline uint16_t operator() (int r, int g, int b) const {
48            return (r<<11)|(g<<5)|b;
49        }
50    } pack565;
51
52    const uint16_t protTexData[] = { pack565(0x03, 0x03, 0x03) };
53    glGenTextures(1, &mProtectedTexName);
54    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
55    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
56    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
57    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
58    glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
59    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1, 1, 0,
60            GL_RGB, GL_UNSIGNED_SHORT_5_6_5, protTexData);
61}
62
63GLES20RenderEngine::~GLES20RenderEngine() {
64}
65
66
67size_t GLES20RenderEngine::getMaxTextureSize() const {
68    return mMaxTextureSize;
69}
70
71size_t GLES20RenderEngine::getMaxViewportDims() const {
72    return
73        mMaxViewportDims[0] < mMaxViewportDims[1] ?
74            mMaxViewportDims[0] : mMaxViewportDims[1];
75}
76
77void GLES20RenderEngine::setViewportAndProjection(
78        size_t vpw, size_t vph, size_t w, size_t h, bool yswap) {
79
80    struct ortho {
81        inline void operator() (GLfloat *m,
82                GLfloat left, GLfloat right, GLfloat bottom, GLfloat top,
83                GLfloat near, GLfloat far) const {
84            memset(m, 0, 16*sizeof(GLfloat));
85            m[ 0] = 2.0f / (right - left);
86            m[ 5] = 2.0f / (top   - bottom);
87            m[10] =-2.0f / (far   - near);
88            m[15] = 1.0f;
89            m[12] = -(right + left) / (right - left);
90            m[13] = -(top + bottom) / (top - bottom);
91            m[14] = -(far + near) / (far - near);
92        }
93    } ortho;
94
95    GLfloat m[16];
96    if (yswap)  ortho(m, 0, w, h, 0, 0, 1);
97    else        ortho(m, 0, w, 0, h, 0, 1);
98
99    glViewport(0, 0, vpw, vph);
100    mState.setProjectionMatrix(m);
101}
102
103void GLES20RenderEngine::setupLayerBlending(
104    bool premultipliedAlpha, bool opaque, int alpha) {
105
106    mState.setPremultipliedAlpha(premultipliedAlpha);
107    mState.setOpaque(opaque);
108    mState.setPlaneAlpha(alpha / 255.0f);
109
110    if (alpha < 0xFF || !opaque) {
111        glEnable(GL_BLEND);
112        glBlendFunc(premultipliedAlpha ? GL_ONE : GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
113    } else {
114        glDisable(GL_BLEND);
115    }
116}
117
118void GLES20RenderEngine::setupDimLayerBlending(int alpha) {
119    mState.setPlaneAlpha(alpha / 255.0f);
120
121    if (alpha == 0xFF) {
122        glDisable(GL_BLEND);
123    } else {
124        glEnable(GL_BLEND);
125        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
126    }
127    disableTexturing();
128}
129
130void GLES20RenderEngine::setupLayerTexturing(const Texture& texture) {
131    GLuint target = texture.getTextureTarget();
132    glBindTexture(target, texture.getTextureName());
133    GLenum filter = GL_NEAREST;
134    if (texture.getFiltering()) {
135        filter = GL_LINEAR;
136    }
137    glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
138    glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
139    glTexParameteri(target, GL_TEXTURE_MAG_FILTER, filter);
140    glTexParameteri(target, GL_TEXTURE_MIN_FILTER, filter);
141
142    mState.setTexture(texture);
143}
144
145void GLES20RenderEngine::setupLayerBlackedOut() {
146    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
147    Texture texture(Texture::TEXTURE_2D, mProtectedTexName);
148    texture.setDimensions(1, 1); // FIXME: we should get that from somewhere
149    mState.setTexture(texture);
150}
151
152void GLES20RenderEngine::disableTexturing() {
153    mState.disableTexture();
154}
155
156void GLES20RenderEngine::disableBlending() {
157    glDisable(GL_BLEND);
158}
159
160
161void GLES20RenderEngine::bindImageAsFramebuffer(EGLImageKHR image,
162        uint32_t* texName, uint32_t* fbName, uint32_t* status) {
163    GLuint tname, name;
164    // turn our EGLImage into a texture
165    glGenTextures(1, &tname);
166    glBindTexture(GL_TEXTURE_2D, tname);
167    glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
168
169    // create a Framebuffer Object to render into
170    glGenFramebuffers(1, &name);
171    glBindFramebuffer(GL_FRAMEBUFFER, name);
172    glFramebufferTexture2D(GL_FRAMEBUFFER,
173            GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, tname, 0);
174
175    *status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
176    *texName = tname;
177    *fbName = name;
178}
179
180void GLES20RenderEngine::unbindFramebuffer(uint32_t texName, uint32_t fbName) {
181    glBindFramebuffer(GL_FRAMEBUFFER, 0);
182    glDeleteFramebuffers(1, &fbName);
183    glDeleteTextures(1, &texName);
184}
185
186void GLES20RenderEngine::fillWithColor(const Mesh& mesh, float r, float g, float b, float a) {
187    mState.setColor(r, g, b, a);
188    disableTexturing();
189    glDisable(GL_BLEND);
190
191    ProgramCache::getInstance().useProgram(mState);
192
193    glVertexAttribPointer(Program::position,
194            mesh.getVertexSize(),
195            GL_FLOAT, GL_FALSE,
196            mesh.getByteStride(),
197            mesh.getPositions());
198
199    glDrawArrays(mesh.getPrimitive(), 0, mesh.getVertexCount());
200}
201
202void GLES20RenderEngine::drawMesh(const Mesh& mesh) {
203
204    ProgramCache::getInstance().useProgram(mState);
205
206    if (mesh.getTexCoordsSize()) {
207        glEnableVertexAttribArray(Program::texCoords);
208        glVertexAttribPointer(Program::texCoords,
209                mesh.getTexCoordsSize(),
210                GL_FLOAT, GL_FALSE,
211                mesh.getByteStride(),
212                mesh.getTexCoords());
213    }
214
215    glVertexAttribPointer(Program::position,
216            mesh.getVertexSize(),
217            GL_FLOAT, GL_FALSE,
218            mesh.getByteStride(),
219            mesh.getPositions());
220
221    glDrawArrays(mesh.getPrimitive(), 0, mesh.getVertexCount());
222
223    if (mesh.getTexCoordsSize()) {
224        glDisableVertexAttribArray(Program::texCoords);
225    }
226}
227
228void GLES20RenderEngine::dump(String8& result) {
229    RenderEngine::dump(result);
230}
231
232// ---------------------------------------------------------------------------
233}; // namespace android
234// ---------------------------------------------------------------------------
235
236#if defined(__gl_h_)
237#error "don't include gl/gl.h in this file"
238#endif
239