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LibGL: Implement glOrtho and underlying functions

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Ali Mohammad Pur 2021-04-24 17:40:15 +04:30 • committed by Andreas Kling
parent f07a7f7b94
commit f601f12801
5 changed files with 43 additions and 0 deletions
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35
Userland/Libraries/LibGL/SoftwareGLContext.cpp
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@ -445,6 +445,41 @@ void SoftwareGLContext::gl_frustum(GLdouble left, GLdouble right, GLdouble botto
m_error = GL_NO_ERROR;
}
void SoftwareGLContext::gl_ortho(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble near_val, GLdouble far_val)
{
if (m_in_draw_state) {
m_error = GL_INVALID_OPERATION;
return;
}
if (left == right || bottom == top || near_val == far_val) {
m_error = GL_INVALID_VALUE;
return;
}
auto rl = right - left;
auto tb = top - bottom;
auto fn = far_val - near_val;
auto tx = -(right + left) / rl;
auto ty = -(top + bottom) / tb;
auto tz = -(far_val + near_val) / fn;
FloatMatrix4x4 projection {
static_cast<float>(2 / rl), 0, 0, static_cast<float>(tx),
0, static_cast<float>(2 / tb), 0, static_cast<float>(ty),
0, 0, static_cast<float>(-2 / fn), static_cast<float>(tz),
0, 0, 0, 1
};
if (m_current_matrix_mode == GL_PROJECTION) {
m_projection_matrix = m_projection_matrix * projection;
} else if (m_current_matrix_mode == GL_MODELVIEW) {
m_projection_matrix = m_model_view_matrix * projection;
}
m_error = GL_NO_ERROR;
}
GLenum SoftwareGLContext::gl_get_error()
{
if (m_in_draw_state) {