A version of testgl2 written using OpenGL ES calls. Necessary because there's no glBegin/glEnd, etc. gsoc2008_iphone
authorHolmes Futrell <hfutrell@umail.ucsb.edu>
Fri, 15 Aug 2008 00:54:21 +0000
branchgsoc2008_iphone
changeset 2430 166821fa1591
parent 2429 2c55b72ba46e
child 2431 7e449145b6ca
A version of testgl2 written using OpenGL ES calls. Necessary because there's no glBegin/glEnd, etc.
test/testgles.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/testgles.c	Fri Aug 15 00:54:21 2008 +0000
@@ -0,0 +1,231 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+
+#include "common.h"
+
+#ifdef __IPHONEOS__
+#define HAVE_OPENGLES
+#endif
+
+#ifdef HAVE_OPENGLES
+
+#include "SDL_opengles.h"
+
+static CommonState *state;
+static SDL_GLContext context;
+
+/* Call this instead of exit(), so we can clean up SDL: atexit() is evil. */
+static void
+quit(int rc)
+{
+    if (context) {
+        /* SDL_GL_MakeCurrent(0, NULL); *//* doesn't do anything */
+        SDL_GL_DeleteContext(context);
+    }
+    CommonQuit(state);
+    exit(rc);
+}
+
+static void
+Render()
+{
+	static GLubyte color[8][4] = { {255, 0, 0, 0},
+		{ 255,	0, 0, 255},
+		{	0, 255, 0, 255},
+		{	0, 255, 0, 255},
+		{	0, 255, 0, 255},
+		{ 255, 255, 255, 255},
+		{ 255,	0, 255, 255},
+		{	0,	0, 255, 255}
+    };
+    static GLfloat cube[8][3] = { {0.5, 0.5, -0.5},
+		{0.5f, -0.5f, -0.5f},
+		{-0.5f, -0.5f, -0.5f},
+		{-0.5f, 0.5f, -0.5f},
+		{-0.5f, 0.5f, 0.5f},
+		{0.5f, 0.5f, 0.5f},
+		{0.5f, -0.5f, 0.5f},
+		{-0.5f, -0.5f, 0.5f}
+    };
+	static GLubyte indices[36] = { 0, 3, 4,\
+								   4, 5, 0,\
+								   0, 5, 6,\
+								   6, 1, 0,\
+								   6, 7, 2,\
+								   2, 1, 6,\
+								   7, 4, 3,\
+								   3, 2, 7,\
+								   5, 4, 7,\
+								   7, 6, 5,\
+								   2, 3, 1,\
+								   3, 0, 1 };
+	
+	
+    /* Do our drawing, too. */
+    glClearColor(0.0, 0.0, 0.0, 1.0);
+    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+		
+	/* Draw the cube */
+	glColorPointer(4, GL_UNSIGNED_BYTE, 0, color);
+	glEnableClientState(GL_COLOR_ARRAY);
+	glVertexPointer(3, GL_FLOAT, 0, cube);
+	glEnableClientState(GL_VERTEX_ARRAY);
+	glDrawElements(GL_TRIANGLES, 36, GL_UNSIGNED_BYTE, indices);
+	
+    glMatrixMode(GL_MODELVIEW);
+    glRotatef(5.0, 1.0, 1.0, 1.0);
+}
+
+int
+main(int argc, char *argv[])
+{
+    int fsaa, accel;
+    int value;
+    int i, done;
+    SDL_DisplayMode mode;
+    SDL_Event event;
+    Uint32 then, now, frames;
+	
+    /* Initialize parameters */
+    fsaa = 0;
+    accel = 0;
+	
+    /* Initialize test framework */
+    state = CommonCreateState(argv, SDL_INIT_VIDEO);
+    if (!state) {
+        return 1;
+    }
+    for (i = 1; i < argc;) {
+        int consumed;
+		
+        consumed = CommonArg(state, i);
+        if (consumed == 0) {
+            if (SDL_strcasecmp(argv[i], "--fsaa") == 0) {
+                ++fsaa;
+                consumed = 1;
+            } else if (SDL_strcasecmp(argv[i], "--accel") == 0) {
+                ++accel;
+                consumed = 1;
+            } else {
+                consumed = -1;
+            }
+        }
+        if (consumed < 0) {
+            fprintf(stderr, "Usage: %s %s [--fsaa] [--accel]\n", argv[0],
+                    CommonUsage(state));
+            quit(1);
+        }
+        i += consumed;
+    }
+	
+    /* Set OpenGL parameters */
+    state->window_flags |= SDL_WINDOW_OPENGL;
+    SDL_GL_SetAttribute(SDL_GL_RED_SIZE, 5);
+    SDL_GL_SetAttribute(SDL_GL_GREEN_SIZE, 5);
+    SDL_GL_SetAttribute(SDL_GL_BLUE_SIZE, 5);
+    SDL_GL_SetAttribute(SDL_GL_DEPTH_SIZE, 16);
+    if (fsaa) {
+        SDL_GL_SetAttribute(SDL_GL_MULTISAMPLEBUFFERS, 1);
+        SDL_GL_SetAttribute(SDL_GL_MULTISAMPLESAMPLES, fsaa);
+    }
+    if (accel) {
+        SDL_GL_SetAttribute(SDL_GL_ACCELERATED_VISUAL, 1);
+    }
+    if (!CommonInit(state)) {
+        quit(2);
+    }
+	
+    /* Create OpenGL context */
+    context = SDL_GL_CreateContext(state->windows[0]);
+    if (!context) {
+        fprintf(stderr, "SDL_GL_CreateContext(): %s\n", SDL_GetError());
+        quit(2);
+    }
+	
+    if (state->render_flags & SDL_RENDERER_PRESENTVSYNC) {
+        SDL_GL_SetSwapInterval(1);
+    } else {
+        SDL_GL_SetSwapInterval(0);
+    }
+	
+    SDL_GetCurrentDisplayMode(&mode);
+    printf("Screen BPP: %d\n", SDL_BITSPERPIXEL(mode.format));
+    printf("\n");
+    printf("Vendor     : %s\n", glGetString(GL_VENDOR));
+    printf("Renderer   : %s\n", glGetString(GL_RENDERER));
+    printf("Version    : %s\n", glGetString(GL_VERSION));
+    printf("Extensions : %s\n", glGetString(GL_EXTENSIONS));
+    printf("\n");
+	
+    SDL_GL_GetAttribute(SDL_GL_RED_SIZE, &value);
+    printf("SDL_GL_RED_SIZE: requested %d, got %d\n", 5, value);
+    SDL_GL_GetAttribute(SDL_GL_GREEN_SIZE, &value);
+    printf("SDL_GL_GREEN_SIZE: requested %d, got %d\n", 5, value);
+    SDL_GL_GetAttribute(SDL_GL_BLUE_SIZE, &value);
+    printf("SDL_GL_BLUE_SIZE: requested %d, got %d\n", 5, value);
+    SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE, &value);
+    printf("SDL_GL_DEPTH_SIZE: requested %d, got %d\n", 16, value);
+    if (fsaa) {
+        SDL_GL_GetAttribute(SDL_GL_MULTISAMPLEBUFFERS, &value);
+        printf("SDL_GL_MULTISAMPLEBUFFERS: requested 1, got %d\n", value);
+        SDL_GL_GetAttribute(SDL_GL_MULTISAMPLESAMPLES, &value);
+        printf("SDL_GL_MULTISAMPLESAMPLES: requested %d, got %d\n", fsaa,
+               value);
+    }
+    if (accel) {
+        SDL_GL_GetAttribute(SDL_GL_ACCELERATED_VISUAL, &value);
+        printf("SDL_GL_ACCELERATED_VISUAL: requested 1, got %d\n", value);
+    }
+	
+    /* Set rendering settings */
+    glMatrixMode(GL_PROJECTION);
+    glLoadIdentity();
+    glOrthof(-2.0, 2.0, -2.0, 2.0, -20.0, 20.0);
+    glMatrixMode(GL_MODELVIEW);
+    glLoadIdentity();
+    glEnable(GL_DEPTH_TEST);
+    glDepthFunc(GL_LESS);
+    glShadeModel(GL_SMOOTH);
+	
+    /* Main render loop */
+    frames = 0;
+    then = SDL_GetTicks();
+    done = 0;
+    while (!done) {
+        /* Check for events */
+        ++frames;
+        while (SDL_PollEvent(&event)) {
+            CommonEvent(state, &event, &done);
+        }
+        for (i = 0; i < state->num_windows; ++i) {
+            int w, h;
+            SDL_GL_MakeCurrent(state->windows[i], context);
+            SDL_GetWindowSize(state->windows[i], &w, &h);
+            glViewport(0, 0, w, h);
+            Render();
+            SDL_GL_SwapWindow(state->windows[i]);
+        }
+    }
+	
+    /* Print out some timing information */
+    now = SDL_GetTicks();
+    if (now > then) {
+        printf("%2.2f frames per second\n",
+               ((double) frames * 1000) / (now - then));
+    }
+    quit(0);
+    return 0;
+}
+
+#else /* HAVE_OPENGLES */
+
+int
+main(int argc, char *argv[])
+{
+    printf("No OpenGL ES support on this system\n");
+    return 1;
+}
+
+#endif /* HAVE_OPENGLES */