From f07a7f7b946852ab0df6201676501578c02ef133 Mon Sep 17 00:00:00 2001
From: Jesse Buhagiar <jooster669@gmail.com>
Date: Sat, 24 Apr 2021 22:43:42 +1000
Subject: LibGL: Impement glLoadMatrixf and underlying function

---
 Userland/Libraries/LibGL/GL/gl.h               |  1 +
 Userland/Libraries/LibGL/GLContext.h           |  2 ++
 Userland/Libraries/LibGL/GLMat.cpp             | 11 +++++++++++
 Userland/Libraries/LibGL/SoftwareGLContext.cpp | 17 +++++++++++++++++
 Userland/Libraries/LibGL/SoftwareGLContext.h   |  1 +
 5 files changed, 32 insertions(+)

(limited to 'Userland/Libraries/LibGL')

diff --git a/Userland/Libraries/LibGL/GL/gl.h b/Userland/Libraries/LibGL/GL/gl.h
index 9979f997cb..76f67d7005 100644
--- a/Userland/Libraries/LibGL/GL/gl.h
+++ b/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();
diff --git a/Userland/Libraries/LibGL/GLContext.h b/Userland/Libraries/LibGL/GLContext.h
index 48bc94d521..4d6f02a4a2 100644
--- a/Userland/Libraries/LibGL/GLContext.h
+++ b/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;
diff --git a/Userland/Libraries/LibGL/GLMat.cpp b/Userland/Libraries/LibGL/GLMat.cpp
index 18d7b73570..7b0bde969f 100644
--- a/Userland/Libraries/LibGL/GLMat.cpp
+++ b/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();
diff --git a/Userland/Libraries/LibGL/SoftwareGLContext.cpp b/Userland/Libraries/LibGL/SoftwareGLContext.cpp
index 0b85ad1778..3dc67eb8cd 100644
--- a/Userland/Libraries/LibGL/SoftwareGLContext.cpp
+++ b/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) {
diff --git a/Userland/Libraries/LibGL/SoftwareGLContext.h b/Userland/Libraries/LibGL/SoftwareGLContext.h
index 33fa7b3feb..54a0cea7a8 100644
--- a/Userland/Libraries/LibGL/SoftwareGLContext.h
+++ b/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;
-- 
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