Reshuffled

src/display/texture.c

@@ -0,0 +1,61 @@
+/**
+ * Copyright (c) 2021 Dominic Masters
+ * 
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "texture.h"
+
+texture_t * textureCreate(int32_t width, int32_t height, pixel_t *pixels) {
+  texture_t *texture = malloc(sizeof(texture_t));
+  if(texture == NULL) return NULL;
+
+  texture->width = width;
+  texture->height = height;
+
+  // Generate a texture ID and bind.
+  glGenTextures(1, &texture->id);
+  glActiveTexture(GL_TEXTURE0);
+  glBindTexture(GL_TEXTURE_2D, texture->id);
+
+  // Setup our preferred texture params
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+  glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+
+  // Start by buffering all transparent black pixels.
+  if(pixels == NULL) {
+    pixels = calloc(width * height, sizeof(pixel_t));
+
+    glTexImage2D(
+      GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
+      GL_RGBA, GL_UNSIGNED_BYTE, pixels
+    );
+
+    free(pixels);
+  } else {
+    glTexImage2D(
+      GL_TEXTURE_2D, 0, GL_RGBA, width, height, 0,
+      GL_RGBA, GL_UNSIGNED_BYTE, pixels
+    );
+  }
+
+  return texture;
+}
+
+void textureBufferPixels(texture_t *texture,
+  int32_t x, int32_t y, int32_t width, int32_t height, pixel_t *pixels
+) {
+  glBindTexture(GL_TEXTURE_2D, texture->id);
+  glTexSubImage2D(GL_TEXTURE_2D, 0,
+    x, y, width, height,
+    GL_RGBA, GL_UNSIGNED_BYTE, pixels
+  );
+}
+
+void textureDispose(texture_t *texture) {
+  glDeleteTextures(1, &texture->id);
+  free(texture);
+}