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#include <gui/ISurfaceComposer.h>
25
26#include "GLES11RenderEngine.h"
27#include "Mesh.h"
28#include "Texture.h"
29
30// ---------------------------------------------------------------------------
31namespace android {
32// ---------------------------------------------------------------------------
33
34GLES11RenderEngine::GLES11RenderEngine() {
35
36    glGetIntegerv(GL_MAX_TEXTURE_SIZE, &mMaxTextureSize);
37    glGetIntegerv(GL_MAX_VIEWPORT_DIMS, mMaxViewportDims);
38
39    glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
40    glPixelStorei(GL_PACK_ALIGNMENT, 4);
41    glEnableClientState(GL_VERTEX_ARRAY);
42    glShadeModel(GL_FLAT);
43    glDisable(GL_DITHER);
44    glDisable(GL_CULL_FACE);
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[] = { 0 };
53    glGenTextures(1, &mProtectedTexName);
54    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
55    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
56    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
57    glTexParameterx(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
58    glTexParameterx(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
63GLES11RenderEngine::~GLES11RenderEngine() {
64}
65
66
67size_t GLES11RenderEngine::getMaxTextureSize() const {
68    return mMaxTextureSize;
69}
70
71size_t GLES11RenderEngine::getMaxViewportDims() const {
72    return
73        mMaxViewportDims[0] < mMaxViewportDims[1] ?
74            mMaxViewportDims[0] : mMaxViewportDims[1];
75}
76
77void GLES11RenderEngine::setViewportAndProjection(
78        size_t vpw, size_t vph, Rect sourceCrop, size_t hwh, bool yswap,
79        Transform::orientation_flags rotation) {
80    glViewport(0, 0, vpw, vph);
81    glMatrixMode(GL_PROJECTION);
82    glLoadIdentity();
83
84    size_t l = sourceCrop.left;
85    size_t r = sourceCrop.right;
86
87    // In GL, (0, 0) is the bottom-left corner, so flip y coordinates
88    size_t t = hwh - sourceCrop.top;
89    size_t b = hwh - sourceCrop.bottom;
90
91    if (yswap) {
92        glOrthof(l, r, t, b, 0, 1);
93    } else {
94        glOrthof(l, r, b, t, 0, 1);
95    }
96
97    switch (rotation) {
98        case Transform::ROT_0:
99            break;
100        case Transform::ROT_90:
101            glRotatef(90, 0, 0, 1);
102            break;
103        case Transform::ROT_180:
104            glRotatef(180, 0, 0, 1);
105            break;
106        case Transform::ROT_270:
107            glRotatef(270, 0, 0, 1);
108            break;
109        default:
110            break;
111    }
112
113    glMatrixMode(GL_MODELVIEW);
114}
115
116void GLES11RenderEngine::setupLayerBlending(
117    bool premultipliedAlpha, bool opaque, int alpha) {
118    GLenum combineRGB;
119    GLenum combineAlpha;
120    GLenum src0Alpha;
121    GLfloat envColor[4];
122
123    if (CC_UNLIKELY(alpha < 0xFF)) {
124        // Cv = premultiplied ? Cs*alpha : Cs
125        // Av = !opaque       ? As*alpha : As
126        combineRGB   = premultipliedAlpha ? GL_MODULATE : GL_REPLACE;
127        combineAlpha = !opaque            ? GL_MODULATE : GL_REPLACE;
128        src0Alpha    = GL_CONSTANT;
129        envColor[0]  = alpha * (1.0f / 255.0f);
130    } else {
131        // Cv = Cs
132        // Av = opaque ? 1.0 : As
133        combineRGB   = GL_REPLACE;
134        combineAlpha = GL_REPLACE;
135        src0Alpha    = opaque ? GL_CONSTANT : GL_TEXTURE;
136        envColor[0]  = 1.0f;
137    }
138
139    glTexEnvi(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_COMBINE);
140    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_RGB, combineRGB);
141    glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_RGB, GL_TEXTURE);
142    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_RGB, GL_SRC_COLOR);
143    if (combineRGB == GL_MODULATE) {
144        glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_RGB, GL_CONSTANT);
145        glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_RGB, GL_SRC_COLOR);
146    }
147    glTexEnvi(GL_TEXTURE_ENV, GL_COMBINE_ALPHA, combineAlpha);
148    glTexEnvi(GL_TEXTURE_ENV, GL_SRC0_ALPHA, src0Alpha);
149    glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND0_ALPHA, GL_SRC_ALPHA);
150    if (combineAlpha == GL_MODULATE) {
151        glTexEnvi(GL_TEXTURE_ENV, GL_SRC1_ALPHA, GL_TEXTURE);
152        glTexEnvi(GL_TEXTURE_ENV, GL_OPERAND1_ALPHA, GL_SRC_ALPHA);
153    }
154    if (combineRGB == GL_MODULATE || src0Alpha == GL_CONSTANT) {
155        envColor[1] = envColor[0];
156        envColor[2] = envColor[0];
157        envColor[3] = envColor[0];
158        glTexEnvfv(GL_TEXTURE_ENV, GL_TEXTURE_ENV_COLOR, envColor);
159    }
160
161    if (alpha < 0xFF || !opaque) {
162        glEnable(GL_BLEND);
163        glBlendFunc(premultipliedAlpha ? GL_ONE : GL_SRC_ALPHA,
164                    GL_ONE_MINUS_SRC_ALPHA);
165    } else {
166        glDisable(GL_BLEND);
167    }
168}
169
170void GLES11RenderEngine::setupDimLayerBlending(int alpha) {
171    glDisable(GL_TEXTURE_EXTERNAL_OES);
172    glDisable(GL_TEXTURE_2D);
173    if (alpha == 0xFF) {
174        glDisable(GL_BLEND);
175    } else {
176        glEnable(GL_BLEND);
177        glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
178    }
179    glColor4f(0, 0, 0, alpha/255.0f);
180}
181
182void GLES11RenderEngine::setupLayerTexturing(const Texture& texture) {
183    GLuint target = texture.getTextureTarget();
184    glBindTexture(target, texture.getTextureName());
185    GLenum filter = GL_NEAREST;
186    if (texture.getFiltering()) {
187        filter = GL_LINEAR;
188    }
189    glTexParameterx(target, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
190    glTexParameterx(target, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
191    glTexParameterx(target, GL_TEXTURE_MAG_FILTER, filter);
192    glTexParameterx(target, GL_TEXTURE_MIN_FILTER, filter);
193    glMatrixMode(GL_TEXTURE);
194    glLoadMatrixf(texture.getMatrix().asArray());
195    glMatrixMode(GL_MODELVIEW);
196    glDisable(GL_TEXTURE_2D);
197    glEnable(GL_TEXTURE_EXTERNAL_OES);
198}
199
200void GLES11RenderEngine::setupLayerBlackedOut() {
201    glBindTexture(GL_TEXTURE_2D, mProtectedTexName);
202    glMatrixMode(GL_TEXTURE);
203    glLoadIdentity();
204    glMatrixMode(GL_MODELVIEW);
205    glDisable(GL_TEXTURE_EXTERNAL_OES);
206    glEnable(GL_TEXTURE_2D);
207}
208
209void GLES11RenderEngine::disableTexturing() {
210    glDisable(GL_TEXTURE_EXTERNAL_OES);
211    glDisable(GL_TEXTURE_2D);
212}
213
214void GLES11RenderEngine::disableBlending() {
215    glDisable(GL_BLEND);
216}
217
218void GLES11RenderEngine::bindImageAsFramebuffer(EGLImageKHR image,
219        uint32_t* texName, uint32_t* fbName, uint32_t* status) {
220    GLuint tname, name;
221    // turn our EGLImage into a texture
222    glGenTextures(1, &tname);
223    glBindTexture(GL_TEXTURE_2D, tname);
224    glEGLImageTargetTexture2DOES(GL_TEXTURE_2D, (GLeglImageOES)image);
225
226    // create a Framebuffer Object to render into
227    glGenFramebuffersOES(1, &name);
228    glBindFramebufferOES(GL_FRAMEBUFFER_OES, name);
229    glFramebufferTexture2DOES(GL_FRAMEBUFFER_OES,
230            GL_COLOR_ATTACHMENT0_OES, GL_TEXTURE_2D, tname, 0);
231
232    *status = glCheckFramebufferStatusOES(GL_FRAMEBUFFER_OES);
233    *texName = tname;
234    *fbName = name;
235}
236
237void GLES11RenderEngine::unbindFramebuffer(uint32_t texName, uint32_t fbName) {
238    glBindFramebufferOES(GL_FRAMEBUFFER_OES, 0);
239    glDeleteFramebuffersOES(1, &fbName);
240    glDeleteTextures(1, &texName);
241}
242
243void GLES11RenderEngine::setupFillWithColor(float r, float g, float b, float a) {
244    glColor4f(r, g, b, a);
245    glDisable(GL_TEXTURE_EXTERNAL_OES);
246    glDisable(GL_TEXTURE_2D);
247    glDisable(GL_BLEND);
248}
249
250void GLES11RenderEngine::drawMesh(const Mesh& mesh) {
251    if (mesh.getTexCoordsSize()) {
252        glEnableClientState(GL_TEXTURE_COORD_ARRAY);
253        glTexCoordPointer(mesh.getTexCoordsSize(),
254                GL_FLOAT,
255                mesh.getByteStride(),
256                mesh.getTexCoords());
257    }
258
259    glVertexPointer(mesh.getVertexSize(),
260            GL_FLOAT,
261            mesh.getByteStride(),
262            mesh.getPositions());
263
264    glDrawArrays(mesh.getPrimitive(), 0, mesh.getVertexCount());
265
266    if (mesh.getTexCoordsSize()) {
267        glDisableClientState(GL_TEXTURE_COORD_ARRAY);
268    }
269}
270
271void GLES11RenderEngine::beginGroup(const mat4& /*colorTransform*/) {
272    // doesn't do anything in GLES 1.1
273}
274
275void GLES11RenderEngine::endGroup() {
276    // doesn't do anything in GLES 1.1
277}
278
279void GLES11RenderEngine::dump(String8& result) {
280    RenderEngine::dump(result);
281}
282
283// ---------------------------------------------------------------------------
284}; // namespace android
285// ---------------------------------------------------------------------------
286
287#if defined(__gl2_h_)
288#error "don't include gl2/gl2.h in this file"
289#endif
290