tests: add new mapbufrange.c test to test GL_ARB_map_buffer_range
This only tests the most basic functionality for now.
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@ -8,7 +8,7 @@ TOP = ../..
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include $(TOP)/configs/current
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LIBS = -L$(TOP)/$(LIB_DIR) -l$(GLUT_LIB) -l$(GLU_LIB) -l$(GL_LIB) $(APP_LIB_DEPS)
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LIBS = -L$(TOP)/$(LIB_DIR) -l$(GLUT_LIB) -l$(GLEW_LIB) -l$(GLU_LIB) -l$(GL_LIB) $(APP_LIB_DEPS)
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SOURCES = \
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afsmultiarb.c \
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@ -54,6 +54,7 @@ SOURCES = \
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jkrahntest.c \
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lineclip.c \
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manytex.c \
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mapbufrange.c \
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mapvbo.c \
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minmag.c \
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mipmap_limits.c \
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@ -0,0 +1,204 @@
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/*
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* Test glMapBuffer() and glMapBufferRange()
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*
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* Fill a VBO with vertex data to draw several colored quads.
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* On each redraw, update the geometry for just one rect in the VBO.
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*
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* Brian Paul
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* 4 March 2009
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*/
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#define GL_GLEXT_PROTOTYPES
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#include <assert.h>
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#include <math.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <GL/glew.h>
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#include <GL/glut.h>
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static GLuint Win;
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static const GLuint NumRects = 10;
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static GLuint BufferID;
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static GLboolean Anim = GL_TRUE;
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static GLboolean UseBufferRange = GL_FALSE;
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static const float RectData[] = {
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/* vertex */ /* color */
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0, -1, 0, 1, 0, 0,
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1, 0, 0, 1, 1, 0,
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0, 1, 0, 0, 1, 1,
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-1, 0, 0, 1, 0, 1
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};
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/**
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* The buffer contains vertex positions (float[3]) and colors (float[3])
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* for 'NumRects' quads.
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* This function updates/rotates one quad in the buffer.
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*/
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static void
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UpdateRect(int r, float angle)
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{
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float *rect;
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int i;
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assert(r < NumRects);
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glBindBufferARB(GL_ARRAY_BUFFER_ARB, BufferID);
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if (UseBufferRange) {
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GLintptr offset = r * sizeof(RectData);
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GLsizeiptr length = sizeof(RectData);
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GLbitfield access = GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_RANGE_BIT;
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float *buf = (float *) glMapBufferRange(GL_ARRAY_BUFFER_ARB,
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offset, length, access);
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rect = buf;
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}
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else {
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/* map whole buffer */
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float *buf = (float *)
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glMapBufferARB(GL_ARRAY_BUFFER_ARB, GL_WRITE_ONLY_ARB);
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rect = buf + r * 24;
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}
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/* set rect verts/colors */
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memcpy(rect, RectData, sizeof(RectData));
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/* loop over four verts, updating vertices */
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for (i = 0; i < 4; i++) {
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float x = 0.2 * RectData[i*6+0];
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float y = 0.2 * RectData[i*6+1];
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float xpos = -2.5 + 0.5 * r;
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float ypos = 0.0;
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/* translate and rotate vert */
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rect[i * 6 + 0] = xpos + x * cos(angle) + y * sin(angle);
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rect[i * 6 + 1] = ypos + x * sin(angle) - y * cos(angle);
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}
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glUnmapBufferARB(GL_ARRAY_BUFFER_ARB);
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}
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static void
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LoadBuffer(void)
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{
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static int frame = 0;
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float angle = glutGet(GLUT_ELAPSED_TIME) * 0.001;
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UpdateRect(frame % NumRects, angle);
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frame++;
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}
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static void
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Draw(void)
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{
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glBindBufferARB(GL_ARRAY_BUFFER_ARB, BufferID);
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glVertexPointer(3, GL_FLOAT, 24, 0);
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glEnable(GL_VERTEX_ARRAY);
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glColorPointer(3, GL_FLOAT, 24, (void*) 12);
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glEnable(GL_COLOR_ARRAY);
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glDrawArrays(GL_QUADS, 0, NumRects * 4);
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if (0)
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glFinish();
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}
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static void
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Display(void)
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{
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glClear(GL_COLOR_BUFFER_BIT);
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Draw();
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glutSwapBuffers();
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}
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static void
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Reshape(int width, int height)
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{
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glViewport(0, 0, width, height);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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glOrtho(-3.0, 3.0, -1.0, 1.0, -1.0, 1.0);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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}
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static void
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Idle(void)
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{
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LoadBuffer();
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glutPostRedisplay();
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}
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static void
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Key(unsigned char key, int x, int y)
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{
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(void) x;
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(void) y;
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if (key == 'a') {
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Anim = !Anim;
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glutIdleFunc(Anim ? Idle : NULL);
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}
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else if (key == 's') {
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LoadBuffer();
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}
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else if (key == 27) {
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glutDestroyWindow(Win);
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exit(0);
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}
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glutPostRedisplay();
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}
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static void
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Init(void)
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{
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GLuint BufferSize = NumRects * sizeof(RectData);
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float *buf;
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if (!glutExtensionSupported("GL_ARB_vertex_buffer_object")) {
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printf("GL_ARB_vertex_buffer_object not found!\n");
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exit(0);
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}
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UseBufferRange = glutExtensionSupported("GL_ARB_map_buffer_range");
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printf("Use GL_ARB_map_buffer_range: %c\n", "NY"[UseBufferRange]);
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printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
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/* initially load buffer with zeros */
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buf = (float *) calloc(1, BufferSize);
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glGenBuffersARB(1, &BufferID);
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glBindBufferARB(GL_ARRAY_BUFFER_ARB, BufferID);
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glBufferDataARB(GL_ARRAY_BUFFER_ARB, BufferSize, buf, GL_DYNAMIC_DRAW_ARB);
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free(buf);
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}
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int
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main(int argc, char *argv[])
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{
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glutInit(&argc, argv);
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glutInitWindowSize(800, 200);
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glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE);
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Win = glutCreateWindow(argv[0]);
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glewInit();
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glutReshapeFunc(Reshape);
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glutKeyboardFunc(Key);
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glutDisplayFunc(Display);
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glutIdleFunc(Anim ? Idle : NULL);
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Init();
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glutMainLoop();
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return 0;
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}
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