Mercurial > hg > ascension / changeset

--- a/src/ascension/datatypes.h	Tue Nov 07 21:24:06 2023 +0100
+++ b/src/ascension/datatypes.h	Wed Nov 08 21:46:29 2023 +0100
@@ -35,6 +35,10 @@
 extern "C" {
 #endif
 
+// --------------------------------------------------------------------------
+//    Datatype Definitions
+// --------------------------------------------------------------------------
+
 typedef unsigned char asc_ubyte;
 typedef signed char asc_sbyte;
 
@@ -62,6 +66,12 @@
 #endif
 } asc_col4f;
 
+typedef float asc_mat4f[4][4];
+
+// --------------------------------------------------------------------------
+//    General Utility Functions
+// --------------------------------------------------------------------------
+
 static inline int asc_clamp_i(int v, int min, int max) {
     if (v < min) return min;
     if (v > max) return max;
@@ -90,6 +100,25 @@
     return r;
 }
 
+// --------------------------------------------------------------------------
+//   Matrix Functions
+// --------------------------------------------------------------------------
+
+static inline void asc_mat4f_ortho(
+        asc_mat4f mat,
+        float left,
+        float right,
+        float bottom,
+        float top
+) {
+    memset(mat, 0, sizeof(float) * 16);
+    mat[0][0] = 2.f / (right - left);
+    mat[1][1] = 2.f / (top - bottom);
+    mat[2][2] = -1;
+    mat[3][0] = -(right + left) / (right - left);
+    mat[3][1] = -(top + bottom) / (top - bottom);
+}
+
 #ifdef __cplusplus
 } // extern "C"
 #endif

--- a/src/ascension/window.h	Tue Nov 07 21:24:06 2023 +0100
+++ b/src/ascension/window.h	Wed Nov 08 21:46:29 2023 +0100
@@ -57,6 +57,7 @@
     SDL_GLContext glctx;
     Uint32 id;
     asc_vec2i dimensions;
+    asc_mat4f projection;
 } AscWindow;
 
 

--- a/src/window.c	Tue Nov 07 21:24:06 2023 +0100
+++ b/src/window.c	Wed Nov 08 21:46:29 2023 +0100
@@ -57,6 +57,7 @@
         if (asc_context.windows[i].id == id) {
             asc_context.windows[i].dimensions.width = width;
             asc_context.windows[i].dimensions.height = height;
+            asc_mat4f_ortho(asc_context.windows[i].projection, 0, (float) width, (float) height, 0);
             return;
         }
     }
@@ -144,6 +145,13 @@
             &window->dimensions.width,
             &window->dimensions.height
     );
+    asc_mat4f_ortho(
+            window->projection,
+            0,
+            (float) window->dimensions.width,
+            (float) window->dimensions.height,
+            0
+    );
 
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_PROFILE_MASK, SDL_GL_CONTEXT_PROFILE_CORE);
     SDL_GL_SetAttribute(SDL_GL_CONTEXT_MAJOR_VERSION, settings->gl_major_version);