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/*
* Copyright (C) 2005-2018 Team Kodi
* This file is part of Kodi - https://kodi.tv
*
* SPDX-License-Identifier: GPL-2.0-or-later
* See LICENSES/README.md for more information.
*/
#include "GLShader.h"
#include "ServiceBroker.h"
#include "rendering/MatrixGL.h"
#include "rendering/RenderSystem.h"
#include "utils/log.h"
#include "windowing/GraphicContext.h"
using namespace Shaders;
CGLShader::CGLShader(const char* shader, const std::string& prefix)
{
m_proj = nullptr;
m_model = nullptr;
m_clipPossible = false;
VertexShader()->LoadSource("gl_shader_vert.glsl");
PixelShader()->LoadSource(shader, prefix);
}
CGLShader::CGLShader(const char* vshader, const char* fshader, const std::string& prefix)
{
m_proj = nullptr;
m_model = nullptr;
m_clipPossible = false;
VertexShader()->LoadSource(vshader, prefix);
PixelShader()->LoadSource(fshader, prefix);
}
void CGLShader::OnCompiledAndLinked()
{
// This is called after CompileAndLink()
// Variables passed directly to the Fragment shader
m_hTex0 = glGetUniformLocation(ProgramHandle(), "m_samp0");
m_hTex1 = glGetUniformLocation(ProgramHandle(), "m_samp1");
m_hUniCol = glGetUniformLocation(ProgramHandle(), "m_unicol");
// Variables passed directly to the Vertex shader
m_hProj = glGetUniformLocation(ProgramHandle(), "m_proj");
m_hModel = glGetUniformLocation(ProgramHandle(), "m_model");
// Vertex attributes
m_hPos = glGetAttribLocation(ProgramHandle(), "m_attrpos");
m_hCol = glGetAttribLocation(ProgramHandle(), "m_attrcol");
m_hCord0 = glGetAttribLocation(ProgramHandle(), "m_attrcord0");
m_hCord1 = glGetAttribLocation(ProgramHandle(), "m_attrcord1");
// It's okay to do this only one time. Textures units never change.
glUseProgram(ProgramHandle());
glUniform1i(m_hTex0, 0);
glUniform1i(m_hTex1, 1);
glUniform4f(m_hUniCol, 1.0, 1.0, 1.0, 1.0);
glUseProgram(0);
}
bool CGLShader::OnEnabled()
{
// This is called after glUseProgram()
const GLfloat *projMatrix = glMatrixProject.Get();
const GLfloat *modelMatrix = glMatrixModview.Get();
glUniformMatrix4fv(m_hProj, 1, GL_FALSE, projMatrix);
glUniformMatrix4fv(m_hModel, 1, GL_FALSE, modelMatrix);
const TransformMatrix &guiMatrix = CServiceBroker::GetWinSystem()->GetGfxContext().GetGUIMatrix();
CRect viewPort; // absolute positions of corners
CServiceBroker::GetRenderSystem()->GetViewPort(viewPort);
/* glScissor operates in window coordinates. In order that we can use it to
* perform clipping, we must ensure that there is an independent linear
* transformation from the coordinate system used by CGraphicContext::ClipRect
* to window coordinates, separately for X and Y (in other words, no
* rotation or shear is introduced at any stage). To do, this, we need to
* check that zeros are present in the following locations:
*
* GUI matrix:
* / * 0 * * \
* | 0 * * * |
* \ 0 0 * * /
* ^ TransformMatrix::TransformX/Y/ZCoord are only ever called with
* input z = 0, so this column doesn't matter
* Model-view matrix:
* / * 0 0 * \
* | 0 * 0 * |
* | 0 0 * * |
* \ * * * * / <- eye w has no influence on window x/y (last column below
* is either 0 or ignored)
* Projection matrix:
* / * 0 0 0 \
* | 0 * 0 0 |
* | * * * * | <- normalised device coordinate z has no influence on window x/y
* \ 0 0 * 0 /
*
* Some of these zeros are not strictly required to ensure this, but they tend
* to be zeroed in the common case, so by checking for zeros here, we simplify
* the calculation of the window x/y coordinates further down the line.
*
* (Minor detail: we don't quite deal in window coordinates as defined by
* OpenGL, because CRenderSystemGLES::SetScissors flips the Y axis. But all
* that's needed to handle that is an effective negation at the stage where
* Y is in normalised device coordinates.)
*/
m_clipPossible = guiMatrix.m[0][1] == 0 &&
guiMatrix.m[1][0] == 0 &&
guiMatrix.m[2][0] == 0 &&
guiMatrix.m[2][1] == 0 &&
modelMatrix[0+1*4] == 0 &&
modelMatrix[0+2*4] == 0 &&
modelMatrix[1+0*4] == 0 &&
modelMatrix[1+2*4] == 0 &&
modelMatrix[2+0*4] == 0 &&
modelMatrix[2+1*4] == 0 &&
projMatrix[0+1*4] == 0 &&
projMatrix[0+2*4] == 0 &&
projMatrix[0+3*4] == 0 &&
projMatrix[1+0*4] == 0 &&
projMatrix[1+2*4] == 0 &&
projMatrix[1+3*4] == 0 &&
projMatrix[3+0*4] == 0 &&
projMatrix[3+1*4] == 0 &&
projMatrix[3+3*4] == 0;
m_clipXFactor = 0.0;
m_clipXOffset = 0.0;
m_clipYFactor = 0.0;
m_clipYOffset = 0.0;
if (m_clipPossible)
{
m_clipXFactor = guiMatrix.m[0][0] * modelMatrix[0+0*4] * projMatrix[0+0*4];
m_clipXOffset = (guiMatrix.m[0][3] * modelMatrix[0+0*4] + modelMatrix[0+3*4]) * projMatrix[0+0*4];
m_clipYFactor = guiMatrix.m[1][1] * modelMatrix[1+1*4] * projMatrix[1+1*4];
m_clipYOffset = (guiMatrix.m[1][3] * modelMatrix[1+1*4] + modelMatrix[1+3*4]) * projMatrix[1+1*4];
float clipW = (guiMatrix.m[2][3] * modelMatrix[2+2*4] + modelMatrix[2+3*4]) * projMatrix[3+2*4];
float xMult = (viewPort.x2 - viewPort.x1) / (2 * clipW);
float yMult = (viewPort.y1 - viewPort.y2) / (2 * clipW); // correct for inverted window coordinate scheme
m_clipXFactor = m_clipXFactor * xMult;
m_clipXOffset = m_clipXOffset * xMult + (viewPort.x2 + viewPort.x1) / 2;
m_clipYFactor = m_clipYFactor * yMult;
m_clipYOffset = m_clipYOffset * yMult + (viewPort.y2 + viewPort.y1) / 2;
}
return true;
}
void CGLShader::Free()
{
// Do Cleanup here
CGLSLShaderProgram::Free();
}
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