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Diffstat (limited to 'backends/graphics/opengl/framebuffer.cpp')
| -rw-r--r-- | backends/graphics/opengl/framebuffer.cpp | 259 |
1 files changed, 259 insertions, 0 deletions
diff --git a/backends/graphics/opengl/framebuffer.cpp b/backends/graphics/opengl/framebuffer.cpp new file mode 100644 index 0000000000..7191aab8bc --- /dev/null +++ b/backends/graphics/opengl/framebuffer.cpp @@ -0,0 +1,259 @@ +/* ScummVM - Graphic Adventure Engine + * + * ScummVM is the legal property of its developers, whose names + * are too numerous to list here. Please refer to the COPYRIGHT + * file distributed with this source distribution. + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. + * + */ + +#include "backends/graphics/opengl/framebuffer.h" +#include "backends/graphics/opengl/texture.h" +#include "backends/graphics/opengl/pipelines/pipeline.h" + +namespace OpenGL { + +Framebuffer::Framebuffer() + : _viewport(), _projectionMatrix(), _isActive(false), _clearColor(), + _blendState(false), _scissorTestState(false), _scissorBox() { +} + +void Framebuffer::activate() { + _isActive = true; + + applyViewport(); + applyProjectionMatrix(); + applyClearColor(); + applyBlendState(); + applyScissorTestState(); + applyScissorBox(); + + activateInternal(); +} + +void Framebuffer::deactivate() { + _isActive = false; + + deactivateInternal(); +} + +void Framebuffer::setClearColor(GLfloat r, GLfloat g, GLfloat b, GLfloat a) { + _clearColor[0] = r; + _clearColor[1] = g; + _clearColor[2] = b; + _clearColor[3] = a; + + // Directly apply changes when we are active. + if (isActive()) { + applyClearColor(); + } +} + +void Framebuffer::enableBlend(bool enable) { + _blendState = enable; + + // Directly apply changes when we are active. + if (isActive()) { + applyBlendState(); + } +} + +void Framebuffer::enableScissorTest(bool enable) { + _scissorTestState = enable; + + // Directly apply changes when we are active. + if (isActive()) { + applyScissorTestState(); + } +} + +void Framebuffer::setScissorBox(GLint x, GLint y, GLsizei w, GLsizei h) { + _scissorBox[0] = x; + _scissorBox[1] = y; + _scissorBox[2] = w; + _scissorBox[3] = h; + + // Directly apply changes when we are active. + if (isActive()) { + applyScissorBox(); + } +} + +void Framebuffer::applyViewport() { + GL_CALL(glViewport(_viewport[0], _viewport[1], _viewport[2], _viewport[3])); +} + +void Framebuffer::applyProjectionMatrix() { + g_context.getActivePipeline()->setProjectionMatrix(_projectionMatrix); +} + +void Framebuffer::applyClearColor() { + GL_CALL(glClearColor(_clearColor[0], _clearColor[1], _clearColor[2], _clearColor[3])); +} + +void Framebuffer::applyBlendState() { + if (_blendState) { + GL_CALL(glEnable(GL_BLEND)); + } else { + GL_CALL(glDisable(GL_BLEND)); + } +} + +void Framebuffer::applyScissorTestState() { + if (_scissorTestState) { + GL_CALL(glEnable(GL_SCISSOR_TEST)); + } else { + GL_CALL(glDisable(GL_SCISSOR_TEST)); + } +} + +void Framebuffer::applyScissorBox() { + GL_CALL(glScissor(_scissorBox[0], _scissorBox[1], _scissorBox[2], _scissorBox[3])); +} + +// +// Backbuffer implementation +// + +void Backbuffer::activateInternal() { +#if !USE_FORCED_GLES + if (g_context.framebufferObjectSupported) { + GL_CALL(glBindFramebuffer(GL_FRAMEBUFFER, 0)); + } +#endif +} + +void Backbuffer::setDimensions(uint width, uint height) { + // Set viewport dimensions. + _viewport[0] = 0; + _viewport[1] = 0; + _viewport[2] = width; + _viewport[3] = height; + + // Setup orthogonal projection matrix. + _projectionMatrix[ 0] = 2.0f / width; + _projectionMatrix[ 1] = 0.0f; + _projectionMatrix[ 2] = 0.0f; + _projectionMatrix[ 3] = 0.0f; + + _projectionMatrix[ 4] = 0.0f; + _projectionMatrix[ 5] = -2.0f / height; + _projectionMatrix[ 6] = 0.0f; + _projectionMatrix[ 7] = 0.0f; + + _projectionMatrix[ 8] = 0.0f; + _projectionMatrix[ 9] = 0.0f; + _projectionMatrix[10] = 0.0f; + _projectionMatrix[11] = 0.0f; + + _projectionMatrix[12] = -1.0f; + _projectionMatrix[13] = 1.0f; + _projectionMatrix[14] = 0.0f; + _projectionMatrix[15] = 1.0f; + + // Directly apply changes when we are active. + if (isActive()) { + applyViewport(); + applyProjectionMatrix(); + } +} + +// +// Render to texture target implementation +// + +#if !USE_FORCED_GLES +TextureTarget::TextureTarget() + : _texture(new GLTexture(GL_RGBA, GL_RGBA, GL_UNSIGNED_BYTE)), _glFBO(0), _needUpdate(true) { +} + +TextureTarget::~TextureTarget() { + delete _texture; + GL_CALL_SAFE(glDeleteFramebuffers, (1, &_glFBO)); +} + +void TextureTarget::activateInternal() { + // Allocate framebuffer object if necessary. + if (!_glFBO) { + GL_CALL(glGenFramebuffers(1, &_glFBO)); + _needUpdate = true; + } + + // Attach destination texture to FBO. + GL_CALL(glBindFramebuffer(GL_FRAMEBUFFER, _glFBO)); + + // If required attach texture to FBO. + if (_needUpdate) { + GL_CALL(glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, _texture->getGLTexture(), 0)); + _needUpdate = false; + } +} + +void TextureTarget::destroy() { + GL_CALL(glDeleteFramebuffers(1, &_glFBO)); + _glFBO = 0; + + _texture->destroy(); +} + +void TextureTarget::create() { + _texture->create(); + + _needUpdate = true; +} + +void TextureTarget::setSize(uint width, uint height) { + _texture->setSize(width, height); + + const uint texWidth = _texture->getWidth(); + const uint texHeight = _texture->getHeight(); + + // Set viewport dimensions. + _viewport[0] = 0; + _viewport[1] = 0; + _viewport[2] = texWidth; + _viewport[3] = texHeight; + + // Setup orthogonal projection matrix. + _projectionMatrix[ 0] = 2.0f / texWidth; + _projectionMatrix[ 1] = 0.0f; + _projectionMatrix[ 2] = 0.0f; + _projectionMatrix[ 3] = 0.0f; + + _projectionMatrix[ 4] = 0.0f; + _projectionMatrix[ 5] = 2.0f / texHeight; + _projectionMatrix[ 6] = 0.0f; + _projectionMatrix[ 7] = 0.0f; + + _projectionMatrix[ 8] = 0.0f; + _projectionMatrix[ 9] = 0.0f; + _projectionMatrix[10] = 0.0f; + _projectionMatrix[11] = 0.0f; + + _projectionMatrix[12] = -1.0f; + _projectionMatrix[13] = -1.0f; + _projectionMatrix[14] = 0.0f; + _projectionMatrix[15] = 1.0f; + + // Directly apply changes when we are active. + if (isActive()) { + applyViewport(); + applyProjectionMatrix(); + } +} +#endif // !USE_FORCED_GLES + +} // End of namespace OpenGL |