LibGL: Impement glLoadMatrixf and underlying function

Userland/Libraries/LibGL/GL/gl.h

@@ -79,6 +79,7 @@ GLAPI void glFrustum(GLdouble left, GLdouble right, GLdouble bottom, GLdouble to
 GLAPI GLenum glGetError();
 GLAPI GLubyte* glGetString(GLenum name);
 GLAPI void glLoadIdentity();
+GLAPI void glLoadMatrixf(const GLfloat* matrix);
 GLAPI void glMatrixMode(GLenum mode);
 GLAPI void glPushMatrix();
 GLAPI void glPopMatrix();

Userland/Libraries/LibGL/GLContext.h

@@ -9,6 +9,7 @@
 
 #include "GL/gl.h"
 #include <AK/OwnPtr.h>
+#include <LibGfx/Matrix4x4.h>
 
 namespace GL {
 
@@ -25,6 +26,7 @@ public:
     virtual GLenum gl_get_error() = 0;
     virtual GLubyte* gl_get_string(GLenum name) = 0;
     virtual void gl_load_identity() = 0;
+    virtual void gl_load_matrix(const FloatMatrix4x4& matrix) = 0;
     virtual void gl_matrix_mode(GLenum mode) = 0;
     virtual void gl_push_matrix() = 0;
     virtual void gl_pop_matrix() = 0;

Userland/Libraries/LibGL/GLMat.cpp

@@ -35,6 +35,17 @@ void glPopMatrix()
     g_gl_context->gl_pop_matrix();
 }
 
+void glLoadMatrixf(const GLfloat* matrix)
+{
+    FloatMatrix4x4 mat(
+        matrix[0], matrix[1], matrix[2], matrix[3],
+        matrix[4], matrix[5], matrix[6], matrix[7],
+        matrix[8], matrix[9], matrix[10], matrix[11],
+        matrix[12], matrix[13], matrix[14], matrix[15]);
+
+    g_gl_context->gl_load_matrix(mat);
+}
+
 void glLoadIdentity()
 {
     g_gl_context->gl_load_identity();

Userland/Libraries/LibGL/SoftwareGLContext.cpp

@@ -494,6 +494,23 @@ void SoftwareGLContext::gl_load_identity()
     m_error = GL_NO_ERROR;
 }
 
+void SoftwareGLContext::gl_load_matrix(const FloatMatrix4x4& matrix)
+{
+    if (m_in_draw_state) {
+        m_error = GL_INVALID_OPERATION;
+        return;
+    }
+
+    if (m_current_matrix_mode == GL_PROJECTION)
+        m_projection_matrix = matrix;
+    else if (m_current_matrix_mode == GL_MODELVIEW)
+        m_model_view_matrix = matrix;
+    else
+        VERIFY_NOT_REACHED();
+
+    m_error = GL_NO_ERROR;
+}
+
 void SoftwareGLContext::gl_matrix_mode(GLenum mode)
 {
     if (m_in_draw_state) {

Userland/Libraries/LibGL/SoftwareGLContext.h

@@ -25,6 +25,7 @@ public:
     virtual GLenum gl_get_error() override;
     virtual GLubyte* gl_get_string(GLenum name) override;
     virtual void gl_load_identity() override;
+    virtual void gl_load_matrix(const FloatMatrix4x4& matrix) override;
     virtual void gl_matrix_mode(GLenum mode) override;
     virtual void gl_push_matrix() override;
     virtual void gl_pop_matrix() override;