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LibGL: Implement glOrtho and underlying functions
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5 changed files with 43 additions and 0 deletions
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@ -445,6 +445,41 @@ void SoftwareGLContext::gl_frustum(GLdouble left, GLdouble right, GLdouble botto
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m_error = GL_NO_ERROR;
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}
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void SoftwareGLContext::gl_ortho(GLdouble left, GLdouble right, GLdouble bottom, GLdouble top, GLdouble near_val, GLdouble far_val)
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{
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if (m_in_draw_state) {
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m_error = GL_INVALID_OPERATION;
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return;
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}
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if (left == right || bottom == top || near_val == far_val) {
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m_error = GL_INVALID_VALUE;
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return;
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}
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auto rl = right - left;
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auto tb = top - bottom;
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auto fn = far_val - near_val;
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auto tx = -(right + left) / rl;
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auto ty = -(top + bottom) / tb;
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auto tz = -(far_val + near_val) / fn;
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FloatMatrix4x4 projection {
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static_cast<float>(2 / rl), 0, 0, static_cast<float>(tx),
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0, static_cast<float>(2 / tb), 0, static_cast<float>(ty),
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0, 0, static_cast<float>(-2 / fn), static_cast<float>(tz),
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0, 0, 0, 1
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};
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if (m_current_matrix_mode == GL_PROJECTION) {
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m_projection_matrix = m_projection_matrix * projection;
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} else if (m_current_matrix_mode == GL_MODELVIEW) {
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m_projection_matrix = m_model_view_matrix * projection;
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}
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m_error = GL_NO_ERROR;
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}
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GLenum SoftwareGLContext::gl_get_error()
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{
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if (m_in_draw_state) {
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