add opengl fronend, remove sdl frontend, refactor build system

1 files changed, 113 insertions, 0 deletions

diff --git a/frontends/calculator/CEdev/examples/gfx_buffered_cube/src/main.c b/frontends/calculator/CEdev/examples/gfx_buffered_cube/src/main.c
new file mode 100644
index 0000000..422e96c
--- /dev/null
+++ b/frontends/calculator/CEdev/examples/gfx_buffered_cube/src/main.c
@@ -0,0 +1,113 @@
+#include <stdbool.h>
+#include <stddef.h>
+#include <stdint.h>
+#include <tice.h>
+
+#include <math.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <graphx.h>
+
+/* Function prototypes */
+void rotate(void);
+
+/* Globals */
+#define ORG (-50)
+#define DEG (6.0)
+#define ANG (DEG * M_PI / 180.0)
+
+/* define the verticies for the two rectangles */
+float face1[4][2] = {
+    { 140,  45 },
+    { 240,  45 },
+    { 240, 145 },
+    { 140, 145 },
+};
+
+float face2[4][2] = {
+    { 140 + ORG,  45 - ORG },
+    { 240 + ORG,  45 - ORG },
+    { 240 + ORG, 145 - ORG },
+    { 140 + ORG, 145 - ORG },
+};
+
+/* declare some globals */
+float sin_angle,
+      cos_angle;
+
+float midx1,
+      midy1,
+      midx2,
+      midy2;
+
+/* Place main code in main */
+void main(void) {
+    uint8_t loop = 0;
+
+    /* Seed the random numbers */
+    srand(rtc_Time());
+
+    /* Get some main variables set up */
+    sin_angle = sin(ANG);
+    cos_angle = cos(ANG);
+    midx1 = (face1[0][0] + face1[1][0]) / 2.0;
+    midy1 = (face1[1][1] + face1[2][1]) / 2.0;
+    midx2 = (face2[0][0] + face2[1][0]) / 2.0;
+    midy2 = (face2[1][1] + face2[2][1]) / 2.0;
+
+    /* Start the graphics routines */
+    gfx_Begin();
+    gfx_SetDrawBuffer();
+
+    /* Loop until a key is pressed */
+    while (!os_GetCSC()) {
+
+        /* Change the color of the cube depending on loop (mod 16) */
+        if (!((loop++) & 0xf)) {
+            gfx_SetColor(rand());
+        }
+
+        /* Call the rotation code */
+        rotate();
+
+        /* Swap the buffer with the screen */
+        gfx_SwapDraw();
+    }
+
+    /* End the graphics */
+    gfx_End();
+}
+
+/* Rotation code */
+void rotate(void) {
+    uint8_t i, j;
+    float tmp1, tmp2;
+
+    /* Compute the new vertex coordinates */
+    for (i=0; i<4; i++) {
+        tmp1 = face1[i][0] - midx1;
+        tmp2 = face1[i][1] - midy1;
+
+        face1[i][0] = midx1 + (tmp1 * cos_angle) - (tmp2 * sin_angle);
+        face1[i][1] = midy1 + (tmp1 * sin_angle) + (tmp2 * cos_angle);
+
+        tmp1 = face2[i][0] - midx2;
+        tmp2 = face2[i][1] - midy2;
+
+        face2[i][0] = midx2 + (tmp1 * cos_angle) - (tmp2 * sin_angle);
+        face2[i][1] = midy2 + (tmp1 * sin_angle) + (tmp2 * cos_angle);
+    }
+
+    /* Clear the drawing buffer */
+    gfx_FillScreen(gfx_white);
+
+    /* Draw the cube */
+    for (i=0; i<4; i++) {
+        j = i + 1 & 3;
+        gfx_Line(face1[i][0], face1[i][1], face1[j][0], face1[j][1]);
+        gfx_Line(face2[i][0], face2[i][1], face2[j][0], face2[j][1]);
+        gfx_Line(face1[i][0], face1[i][1], face2[i][0], face2[i][1]);
+    }
+}