Add basic block textures

- Remove the code that sent colors through uniform variables, instead
  send texture data
- Each vertex now has a texture coordinate
- struct texture is a easy way to represent textures, can be extended
  later
- Shaders updated to use textures

1 files changed, 10 insertions, 0 deletions

diff --git a/src/shader.c b/src/shader.c
index 9c36791..c32b12f 100644
--- a/src/shader.c
+++ b/src/shader.c
@@ -82,3 +82,13 @@ int set_uniform_mat4(char* var, struct shader* shader, mat4 matrix) {
     glUniformMatrix4fv(loc, 1, GL_FALSE, (void*)matrix);
     return 0;
 }
+int set_uniform_sampler2d(char* var, struct shader* shader, mat4 matrix) {
+    GLuint loc = glGetUniformLocation(shader->program, var);
+    if (loc == -1) {
+        fprintf(stderr, "Invalid var %s for get_uniform_mat4: Does not exist\n", var);
+        exit(1);
+        return -1;
+    }
+    glUniformMatrix4fv(loc, 1, GL_FALSE, (void*)matrix);
+    return 0;
+}