From d360bf17d5f67d1e0e33899f7af7184227c55f06 Mon Sep 17 00:00:00 2001
From: Logan McNaughton <loganmc10@users.noreply.github.com>
Date: Wed, 28 Sep 2016 08:18:32 -0600
Subject: [PATCH] Yet another fix for glUniformMatrix4fv

This should fix fullscreen toggling/context resets.
---
 gfx/drivers_shader/shader_glsl.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/gfx/drivers_shader/shader_glsl.c b/gfx/drivers_shader/shader_glsl.c
index 046448f3d0..b06ef392b0 100644
--- a/gfx/drivers_shader/shader_glsl.c
+++ b/gfx/drivers_shader/shader_glsl.c
@@ -149,6 +149,8 @@ typedef struct glsl_shader_data
 static bool glsl_core;
 static unsigned glsl_major;
 static unsigned glsl_minor;
+static float current_mat_data[GFX_MAX_SHADERS];
+static unsigned current_idx;
 
 static GLint gl_glsl_get_uniform(glsl_shader_data_t *glsl,
       GLuint prog, const char *base)
@@ -646,6 +648,7 @@ static void gl_glsl_destroy_resources(glsl_shader_data_t *glsl)
    if (!glsl)
       return;
 
+   current_idx = 0;
    glUseProgram(0);
    for (i = 0; i < GFX_MAX_SHADERS; i++)
    {
@@ -1256,8 +1259,6 @@ static void gl_glsl_set_params(void *data, void *shader_data,
 
 static bool gl_glsl_set_mvp(void *data, void *shader_data, const math_matrix_4x4 *mat)
 {
-   static float current_mat_data[GFX_MAX_SHADERS];
-   static unsigned current_idx;
    int loc;
    glsl_shader_data_t *glsl = (glsl_shader_data_t*)shader_data;
 
@@ -1268,10 +1269,10 @@ static bool gl_glsl_set_mvp(void *data, void *shader_data, const math_matrix_4x4
 
    loc = glsl->uniforms[glsl->active_idx].mvp;
    if (loc >= 0) {
-      if (current_idx != glsl->active_idx || *mat->data != current_mat_data[loc]) {
+      if (current_idx != glsl->active_idx || *mat->data != current_mat_data[glsl->active_idx]) {
          glUniformMatrix4fv(loc, 1, GL_FALSE, mat->data);
          current_idx = glsl->active_idx;
-         current_mat_data[loc] = *mat->data;
+         current_mat_data[glsl->active_idx] = *mat->data;
       }
    }
    return true;