1/*
2 * Copyright (C) 2011 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
18#include "rsdFrameBufferObj.h"
19#include "rsdAllocation.h"
20#include "rsdGL.h"
21
22#include <GLES2/gl2.h>
23#include <GLES2/gl2ext.h>
24
25using namespace android;
26using namespace android::renderscript;
27
28RsdFrameBufferObj::RsdFrameBufferObj() {
29    mFBOId = 0;
30    mWidth = 0;
31    mHeight = 0;
32    mColorTargetsCount = 1;
33    mColorTargets = new DrvAllocation*[mColorTargetsCount];
34    for (uint32_t i = 0; i < mColorTargetsCount; i ++) {
35        mColorTargets[i] = 0;
36    }
37    mDepthTarget = NULL;
38    mDirty = true;
39}
40
41RsdFrameBufferObj::~RsdFrameBufferObj() {
42    if(mFBOId != 0) {
43        glDeleteFramebuffers(1, &mFBOId);
44    }
45    delete [] mColorTargets;
46}
47
48void RsdFrameBufferObj::checkError(const Context *rsc) {
49    GLenum status;
50    status = glCheckFramebufferStatus(GL_FRAMEBUFFER);
51    switch (status) {
52    case GL_FRAMEBUFFER_COMPLETE:
53        break;
54    case GL_FRAMEBUFFER_INCOMPLETE_ATTACHMENT:
55        rsc->setError(RS_ERROR_BAD_VALUE,
56                      "Unable to set up render Target: RFRAMEBUFFER_INCOMPLETE_ATTACHMENT");
57        break;
58    case GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT:
59        rsc->setError(RS_ERROR_BAD_VALUE,
60                      "Unable to set up render Target: GL_FRAMEBUFFER_INCOMPLETE_MISSING_ATTACHMENT");
61        break;
62    case GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS:
63        rsc->setError(RS_ERROR_BAD_VALUE,
64                      "Unable to set up render Target: GL_FRAMEBUFFER_INCOMPLETE_DIMENSIONS");
65        break;
66    case GL_FRAMEBUFFER_UNSUPPORTED:
67        rsc->setError(RS_ERROR_BAD_VALUE,
68                      "Unable to set up render Target: GL_FRAMEBUFFER_UNSUPPORTED");
69        break;
70    }
71}
72
73
74void RsdFrameBufferObj::setDepthAttachment() {
75    if (mDepthTarget != NULL) {
76        if (mDepthTarget->textureID) {
77            glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
78                                   GL_TEXTURE_2D, mDepthTarget->textureID, 0);
79        } else {
80            glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT,
81                                      GL_RENDERBUFFER, mDepthTarget->renderTargetID);
82        }
83    } else {
84        // Reset last attachment
85        glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_RENDERBUFFER, 0);
86        glFramebufferTexture2D(GL_FRAMEBUFFER, GL_DEPTH_ATTACHMENT, GL_TEXTURE_2D, 0, 0);
87    }
88}
89
90void RsdFrameBufferObj::setColorAttachment() {
91    // Now attach color targets
92    for (uint32_t i = 0; i < mColorTargetsCount; i ++) {
93        if (mColorTargets[i] != NULL) {
94            if (mColorTargets[i]->textureID) {
95                glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i,
96                                       GL_TEXTURE_2D, mColorTargets[i]->textureID, 0);
97            } else {
98                glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i,
99                                          GL_RENDERBUFFER, mColorTargets[i]->renderTargetID);
100            }
101        } else {
102            // Reset last attachment
103            glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i,
104                                      GL_RENDERBUFFER, 0);
105            glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0 + i,
106                                   GL_TEXTURE_2D, 0, 0);
107        }
108    }
109}
110
111bool RsdFrameBufferObj::renderToFramebuffer() {
112    if (mDepthTarget != NULL) {
113        return false;
114    }
115
116    for (uint32_t i = 0; i < mColorTargetsCount; i ++) {
117        if (mColorTargets[i] != NULL) {
118            return false;
119        }
120    }
121    return true;
122}
123
124void RsdFrameBufferObj::setActive(const Context *rsc) {
125    bool framebuffer = renderToFramebuffer();
126    if (!framebuffer) {
127        if(mFBOId == 0) {
128            RSD_CALL_GL(glGenFramebuffers, 1, &mFBOId);
129        }
130        RSD_CALL_GL(glBindFramebuffer, GL_FRAMEBUFFER, mFBOId);
131
132        if (mDirty) {
133            setDepthAttachment();
134            setColorAttachment();
135            mDirty = false;
136        }
137
138        RSD_CALL_GL(glViewport, 0, 0, mWidth, mHeight);
139        checkError(rsc);
140    } else {
141        RSD_CALL_GL(glBindFramebuffer, GL_FRAMEBUFFER, 0);
142        RSD_CALL_GL(glViewport, 0, 0, rsc->getWidth(), rsc->getHeight());
143    }
144}
145