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 <utils/String8.h>
21#include <cutils/compiler.h>
22
23#include "GLES11RenderEngine.h"
24#include "Mesh.h"
25#include "Texture.h"
26
27// ---------------------------------------------------------------------------
28namespace android {
29// ---------------------------------------------------------------------------
30
31GLES11RenderEngine::GLES11RenderEngine() {
32
33    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
34    glGetIntegerv(GL_MAX_VIEWPORT_DIMS, mMaxViewportDims);
35
36    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
37    glPixelStorei(GL_PACK_ALIGNMENT, 4);
38    glEnableClientState(GL_VERTEX_ARRAY);
39    glShadeModel(GL_FLAT);
40    glDisable(GL_DITHER);
41    glDisable(GL_CULL_FACE);
42
43    struct pack565 {
44        inline uint16_t operator() (int r, int g, int b) const {
45            return (r<<11)|(g<<5)|b;
46        }
47    } pack565;
48
49    const uint16_t protTexData[] = { 0 };
50    glGenTextures(1, &mProtectedTexName);
51    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
52    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
53    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
54    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
55    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
56    glTexImage2D(GL_TEXTURE_2D, 0, GL_RGB, 1, 1, 0,
57            GL_RGB, GL_UNSIGNED_SHORT_5_6_5, protTexData);
58}
59
60GLES11RenderEngine::~GLES11RenderEngine() {
61}
62
63
64size_t GLES11RenderEngine::getMaxTextureSize() const {
65    return mMaxTextureSize;
66}
67
68size_t GLES11RenderEngine::getMaxViewportDims() const {
69    return
70        mMaxViewportDims[0] < mMaxViewportDims[1] ?
71            mMaxViewportDims[0] : mMaxViewportDims[1];
72}
73
74void GLES11RenderEngine::setViewportAndProjection(
75        size_t vpw, size_t vph, size_t w, size_t h, bool yswap) {
76    glViewport(0, 0, vpw, vph);
77    glMatrixMode(GL_PROJECTION);
78    glLoadIdentity();
79    // put the origin in the left-bottom corner
80    if (yswap)  glOrthof(0, w, h, 0, 0, 1);
81    else        glOrthof(0, w, 0, h, 0, 1);
82    glMatrixMode(GL_MODELVIEW);
83}
84
85void GLES11RenderEngine::setupLayerBlending(
86    bool premultipliedAlpha, bool opaque, int alpha) {
87    GLenum combineRGB;
88    GLenum combineAlpha;
89    GLenum src0Alpha;
90    GLfloat envColor[4];
91
92    if (CC_UNLIKELY(alpha < 0xFF)) {
93        // Cv = premultiplied ? Cs*alpha : Cs
94        // Av = !opaque       ? As*alpha : As
95        combineRGB   = premultipliedAlpha ? GL_MODULATE : GL_REPLACE;
96        combineAlpha = !opaque            ? GL_MODULATE : GL_REPLACE;
97        src0Alpha    = GL_CONSTANT;
98        envColor[0]  = alpha * (1.0f / 255.0f);
99    } else {
100        // Cv = Cs
101        // Av = opaque ? 1.0 : As
102        combineRGB   = GL_REPLACE;
103        combineAlpha = GL_REPLACE;
104        src0Alpha    = opaque ? GL_CONSTANT : GL_TEXTURE;
105        envColor[0]  = 1.0f;
106    }
107
108    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
109    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, combineRGB);
110    glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_RGB, GL_TEXTURE);
111    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
112    if (combineRGB == GL_MODULATE) {
113        glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_RGB, GL_CONSTANT);
114        glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
115    }
116    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, combineAlpha);
117    glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_ALPHA, src0Alpha);
118    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
119    if (combineAlpha == GL_MODULATE) {
120        glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_ALPHA, GL_TEXTURE);
121        glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);
122    }
123    if (combineRGB == GL_MODULATE || src0Alpha == GL_CONSTANT) {
124        envColor[1] = envColor[0];
125        envColor[2] = envColor[0];
126        envColor[3] = envColor[0];
127        glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, envColor);
128    }
129
130    if (alpha < 0xFF || !opaque) {
131        glEnable(GL_BLEND);
132        glBlendFunc(premultipliedAlpha ? GL_ONE : GL_SRC_ALPHA,
133                    GL_ONE_MINUS_SRC_ALPHA);
134    } else {
135        glDisable(GL_BLEND);
136    }
137}
138
139void GLES11RenderEngine::setupDimLayerBlending(int alpha) {
140    glDisable(GL_TEXTURE_EXTERNAL_OES);
141    glDisable(GL_TEXTURE_2D);
142    if (alpha == 0xFF) {
143        glDisable(GL_BLEND);
144    } else {
145        glEnable(GL_BLEND);
146        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
147    }
148    glColor4f(0, 0, 0, alpha/255.0f);
149}
150
151void GLES11RenderEngine::setupLayerTexturing(const Texture& texture) {
152    GLuint target = texture.getTextureTarget();
153    glBindTexture(target, texture.getTextureName());
154    GLenum filter = GL_NEAREST;
155    if (texture.getFiltering()) {
156        filter = GL_LINEAR;
157    }
158    glTexParameterx(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
159    glTexParameterx(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
160    glTexParameterx(target, GL_TEXTURE_MAG_FILTER, filter);
161    glTexParameterx(target, GL_TEXTURE_MIN_FILTER, filter);
162    glMatrixMode(GL_TEXTURE);
163    glLoadMatrixf(texture.getMatrix().asArray());
164    glMatrixMode(GL_MODELVIEW);
165    glDisable(GL_TEXTURE_2D);
166    glEnable(GL_TEXTURE_EXTERNAL_OES);
167}
168
169void GLES11RenderEngine::setupLayerBlackedOut() {
170    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
171    glMatrixMode(GL_TEXTURE);
172    glLoadIdentity();
173    glMatrixMode(GL_MODELVIEW);
174    glDisable(GL_TEXTURE_EXTERNAL_OES);
175    glEnable(GL_TEXTURE_2D);
176}
177
178void GLES11RenderEngine::disableTexturing() {
179    glDisable(GL_TEXTURE_EXTERNAL_OES);
180    glDisable(GL_TEXTURE_2D);
181}
182
183void GLES11RenderEngine::disableBlending() {
184    glDisable(GL_BLEND);
185}
186
187void GLES11RenderEngine::bindImageAsFramebuffer(EGLImageKHR image,
188        uint32_t* texName, uint32_t* fbName, uint32_t* status) {
189    GLuint tname, name;
190    // turn our EGLImage into a texture
191    glGenTextures(1, &tname);
192    glBindTexture(GL_TEXTURE_2D, tname);
193    glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
194
195    // create a Framebuffer Object to render into
196    glGenFramebuffersOES(1, &name);
197    glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
198    glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES,
199            GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, tname, 0);
200
201    *status = glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);
202    *texName = tname;
203    *fbName = name;
204}
205
206void GLES11RenderEngine::unbindFramebuffer(uint32_t texName, uint32_t fbName) {
207    glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
208    glDeleteFramebuffersOES(1, &fbName);
209    glDeleteTextures(1, &texName);
210}
211
212void GLES11RenderEngine::setupFillWithColor(float r, float g, float b, float a) {
213    glColor4f(r, g, b, a);
214    glDisable(GL_TEXTURE_EXTERNAL_OES);
215    glDisable(GL_TEXTURE_2D);
216    glDisable(GL_BLEND);
217}
218
219void GLES11RenderEngine::drawMesh(const Mesh& mesh) {
220    if (mesh.getTexCoordsSize()) {
221        glEnableClientState(GL_TEXTURE_COORD_ARRAY);
222        glTexCoordPointer(mesh.getTexCoordsSize(),
223                GL_FLOAT,
224                mesh.getByteStride(),
225                mesh.getTexCoords());
226    }
227
228    glVertexPointer(mesh.getVertexSize(),
229            GL_FLOAT,
230            mesh.getByteStride(),
231            mesh.getPositions());
232
233    glDrawArrays(mesh.getPrimitive(), 0, mesh.getVertexCount());
234
235    if (mesh.getTexCoordsSize()) {
236        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
237    }
238}
239
240void GLES11RenderEngine::beginGroup(const mat4& colorTransform) {
241    // doesn't do anything in GLES 1.1
242}
243
244void GLES11RenderEngine::endGroup() {
245    // doesn't do anything in GLES 1.1
246}
247
248void GLES11RenderEngine::dump(String8& result) {
249    RenderEngine::dump(result);
250}
251
252// ---------------------------------------------------------------------------
253}; // namespace android
254// ---------------------------------------------------------------------------
255
256#if defined(__gl2_h_)
257#error "don't include gl2/gl2.h in this file"
258#endif
259