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introduce matrix class and use it

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Eduardo Bart
2011-12-24 21:14:12 -02:00
parent 339697fce9
commit 3abbf5255e
22 changed files with 366 additions and 317 deletions
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34
src/framework/graphics/graphics.cpp
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@@ -24,21 +24,18 @@
#include <framework/graphics/graphics.h>
#include <framework/graphics/texture.h>
#include <framework/platform/platformwindow.h>
Graphics g_graphics;
void Graphics::init()
{
// setup opengl
glEnable(GL_BLEND);
glClearColor(0.0f, 0.0f, 0.0f, 0.0f);
logInfo("GPU ", glGetString(GL_RENDERER));
logInfo("OpenGL ", glGetString(GL_VERSION));
//if(!isExtensionSupported("GL_ARB_framebuffer_object"))
// logFatal("Your graphics card is not supported.");
m_emptyTexture = TexturePtr(new Texture);
g_painter.init();
@@ -60,9 +57,26 @@ bool Graphics::isExtensionSupported(const char *extension)
void Graphics::resize(const Size& size)
{
glViewport(0, 0, size.width(), size.height());
g_painter.updateProjectionMatrix(size);
m_viewportSize = size;
setViewportSize(size);
// The projection matrix converts from Painter's coordinate system to GL's coordinate system
// * GL's viewport is 2x2, Painter's is width x height
// * GL has +y -> -y going from bottom -> top, Painter is the other way round
// * GL has [0,0] in the center, Painter has it in the top-left
//
// This results in the Projection matrix below.
//
// Projection Matrix Painter Coord GL Coord
// ------------------------------------------------ --------- ---------
// | 2.0 / width | 0.0 | -1.0 | | x | | x' |
// | 0.0 | -2.0 / height | 1.0 | * | y | = | y' |
// | 0.0 | 0.0 | 0.0 | | 1 | | 0 |
// ------------------------------------------------ --------- ---------
Matrix3 projectionMatrix = { 2.0f/size.width(), 0.0f, -1.0f,
0.0f, -2.0f/size.height(), 1.0f,
0.0f, 0.0f, 0.0f };
projectionMatrix.transpose();
g_painter.setProjectionMatrix(projectionMatrix);
}
void Graphics::beginRender()
@@ -74,3 +88,9 @@ void Graphics::endRender()
{
}
void Graphics::setViewportSize(const Size& size)
{
glViewport(0, 0, size.width(), size.height());
m_viewportSize = size;
}