GLES20RenderEngine.cpp revision 19733a32799f792125913e746e8644d16f8dc223 
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(1.0f);
120    mState.setPremultipliedAlpha(true);
121    mState.setOpaque(false);
122    mState.setColor(0, 0, 0, alpha/255.0f);
123    mState.disableTexture();
124
125    if (alpha == 0xFF) {
126        glDisable(GL_BLEND);
127    } else {
128        glEnable(GL_BLEND);
129        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
130    }
131}
132
133void GLES20RenderEngine::setupLayerTexturing(const Texture& texture) {
134    GLuint target = texture.getTextureTarget();
135    glBindTexture(target, texture.getTextureName());
136    GLenum filter = GL_NEAREST;
137    if (texture.getFiltering()) {
138        filter = GL_LINEAR;
139    }
140    glTexParameteri(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
141    glTexParameteri(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
142    glTexParameteri(target, GL_TEXTURE_MAG_FILTER, filter);
143    glTexParameteri(target, GL_TEXTURE_MIN_FILTER, filter);
144
145    mState.setTexture(texture);
146}
147
148void GLES20RenderEngine::setupLayerBlackedOut() {
149    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
150    Texture texture(Texture::TEXTURE_2D, mProtectedTexName);
151    texture.setDimensions(1, 1); // FIXME: we should get that from somewhere
152    mState.setTexture(texture);
153}
154
155void GLES20RenderEngine::disableTexturing() {
156    mState.disableTexture();
157}
158
159void GLES20RenderEngine::disableBlending() {
160    glDisable(GL_BLEND);
161}
162
163
164void GLES20RenderEngine::bindImageAsFramebuffer(EGLImageKHR image,
165        uint32_t* texName, uint32_t* fbName, uint32_t* status) {
166    GLuint tname, name;
167    // turn our EGLImage into a texture
168    glGenTextures(1, &tname);
169    glBindTexture(GL_TEXTURE_2D, tname);
170    glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
171
172    // create a Framebuffer Object to render into
173    glGenFramebuffers(1, &name);
174    glBindFramebuffer(GL_FRAMEBUFFER, name);
175    glFramebufferTexture2D(GL_FRAMEBUFFER,
176            GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, tname, 0);
177
178    *status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
179    *texName = tname;
180    *fbName = name;
181}
182
183void GLES20RenderEngine::unbindFramebuffer(uint32_t texName, uint32_t fbName) {
184    glBindFramebuffer(GL_FRAMEBUFFER, 0);
185    glDeleteFramebuffers(1, &fbName);
186    glDeleteTextures(1, &texName);
187}
188
189void GLES20RenderEngine::setupFillWithColor(float r, float g, float b, float a) {
190    mState.setPlaneAlpha(1.0f);
191    mState.setPremultipliedAlpha(true);
192    mState.setOpaque(false);
193    mState.setColor(r, g, b, a);
194    mState.disableTexture();
195    glDisable(GL_BLEND);
196}
197
198void GLES20RenderEngine::drawMesh(const Mesh& mesh) {
199
200    ProgramCache::getInstance().useProgram(mState);
201
202    if (mesh.getTexCoordsSize()) {
203        glEnableVertexAttribArray(Program::texCoords);
204        glVertexAttribPointer(Program::texCoords,
205                mesh.getTexCoordsSize(),
206                GL_FLOAT, GL_FALSE,
207                mesh.getByteStride(),
208                mesh.getTexCoords());
209    }
210
211    glVertexAttribPointer(Program::position,
212            mesh.getVertexSize(),
213            GL_FLOAT, GL_FALSE,
214            mesh.getByteStride(),
215            mesh.getPositions());
216
217    glDrawArrays(mesh.getPrimitive(), 0, mesh.getVertexCount());
218
219    if (mesh.getTexCoordsSize()) {
220        glDisableVertexAttribArray(Program::texCoords);
221    }
222}
223
224void GLES20RenderEngine::dump(String8& result) {
225    RenderEngine::dump(result);
226}
227
228// ---------------------------------------------------------------------------
229}; // namespace android
230// ---------------------------------------------------------------------------
231
232#if defined(__gl_h_)
233#error "don't include gl/gl.h in this file"
234#endif
235