a-game

commit 56d21f210cb40456a3d30d35d7e429808a3a2dd9
parent 300221b1551048b29b92b78fee9da849dc64c71c
Author: amin <dev@aminmesbah.com>
Date:   Mon,  8 Jul 2019 20:38:11 +0000

Convert BGRA image to RGBA

FossilOrigin-Name: 4fadea43f5ca769f50a8e248fa85cf09e81588b167113395e70c7f38087df976
Diffstat:
M
src/game.c
 | 
1
-
M
src/image.c
 | 
9
+++++++++
M
src/render.c
 | 
2
+-

3 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/src/game.c b/src/game.c
@@ -194,7 +194,6 @@ internal void game_init(struct GameMemory *game_memory, v2u framebuffer)
     // game_load_images
     {
         size_t file_len = 0;
-        //u8 *t = platform.platform_read_entire_file("assets/test_sw_origin.tga", &file_len);
         u8 *t = platform.platform_read_entire_file("assets/tile0.tga", &file_len);
         assert(t);
 
diff --git a/src/image.c b/src/image.c
@@ -102,6 +102,15 @@ internal u8 *img_load_from_memory(u8 *buffer, size_t len, i32 *out_width, i32 *o
         }
     }
 
+    // NOTE(amin): we convert BGRA to RGBA because OpenGL ES and WebGL don't
+    // support the GL_BGRA texture format.
+    for (size_t b = 0; b < img_data_buf_len; b += 4)
+    {
+        u8 temp = img_data[b];
+        img_data[b + 0] = img_data[b + 2];
+        img_data[b + 2] = temp;
+    }
+
     // NOTE(amin): Intentional truncating division. If height is odd, we want
     // our last row offset to be 1 less than the middle row.
     u32 half_height = h.height / 2;
diff --git a/src/render.c b/src/render.c
@@ -53,7 +53,7 @@ internal void renderer_init(struct RendererState *renderer, struct Image *images
         u32 texture_id;
         glGenTextures(1, &texture_id);
         glBindTexture(GL_TEXTURE_2D, texture_id);
-        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, img.dim.width, img.dim.height, 0, GL_BGRA, GL_UNSIGNED_BYTE, img.data);
+        glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, img.dim.width, img.dim.height, 0, GL_RGBA, GL_UNSIGNED_BYTE, img.data);
         glGenerateMipmap(GL_TEXTURE_2D);
 
         glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);