diff options
Diffstat (limited to 'progs')
| -rw-r--r-- | progs/tests/Makefile | 3 | ||||
| -rw-r--r-- | progs/tests/mapbufrange.c | 204 |
2 files changed, 206 insertions, 1 deletions
diff --git a/progs/tests/Makefile b/progs/tests/Makefile index a70a6ab9ab..b6ce44008d 100644 --- a/progs/tests/Makefile +++ b/progs/tests/Makefile @@ -8,7 +8,7 @@ TOP = ../.. include $(TOP)/configs/current -LIBS = -L$(TOP)/$(LIB_DIR) -l$(GLUT_LIB) -l$(GLU_LIB) -l$(GL_LIB) $(APP_LIB_DEPS) +LIBS = -L$(TOP)/$(LIB_DIR) -l$(GLUT_LIB) -l$(GLEW_LIB) -l$(GLU_LIB) -l$(GL_LIB) $(APP_LIB_DEPS) SOURCES = \ afsmultiarb.c \ @@ -54,6 +54,7 @@ SOURCES = \ jkrahntest.c \ lineclip.c \ manytex.c \ + mapbufrange.c \ mapvbo.c \ minmag.c \ mipmap_limits.c \ diff --git a/progs/tests/mapbufrange.c b/progs/tests/mapbufrange.c new file mode 100644 index 0000000000..04d57b58f1 --- /dev/null +++ b/progs/tests/mapbufrange.c @@ -0,0 +1,204 @@ +/* + * Test glMapBuffer() and glMapBufferRange() + * + * Fill a VBO with vertex data to draw several colored quads. + * On each redraw, update the geometry for just one rect in the VBO. + * + * Brian Paul + * 4 March 2009 + */ + + +#define GL_GLEXT_PROTOTYPES +#include <assert.h> +#include <math.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <GL/glew.h> +#include <GL/glut.h> + +static GLuint Win; +static const GLuint NumRects = 10; +static GLuint BufferID; +static GLboolean Anim = GL_TRUE; +static GLboolean UseBufferRange = GL_FALSE; + + + +static const float RectData[] = { + /* vertex */ /* color */ + 0, -1, 0, 1, 0, 0, + 1, 0, 0, 1, 1, 0, + 0, 1, 0, 0, 1, 1, + -1, 0, 0, 1, 0, 1 +}; + + +/** + * The buffer contains vertex positions (float[3]) and colors (float[3]) + * for 'NumRects' quads. + * This function updates/rotates one quad in the buffer. + */ +static void +UpdateRect(int r, float angle) +{ + float *rect; + int i; + + assert(r < NumRects); + + glBindBufferARB(GL_ARRAY_BUFFER_ARB, BufferID); + if (UseBufferRange) { + GLintptr offset = r * sizeof(RectData); + GLsizeiptr length = sizeof(RectData); + GLbitfield access = GL_MAP_WRITE_BIT | GL_MAP_INVALIDATE_RANGE_BIT; + float *buf = (float *) glMapBufferRange(GL_ARRAY_BUFFER_ARB, + offset, length, access); + rect = buf; + } + else { + /* map whole buffer */ + float *buf = (float *) + glMapBufferARB(GL_ARRAY_BUFFER_ARB, GL_WRITE_ONLY_ARB); + rect = buf + r * 24; + } + + /* set rect verts/colors */ + memcpy(rect, RectData, sizeof(RectData)); + + /* loop over four verts, updating vertices */ + for (i = 0; i < 4; i++) { + float x = 0.2 * RectData[i*6+0]; + float y = 0.2 * RectData[i*6+1]; + float xpos = -2.5 + 0.5 * r; + float ypos = 0.0; + + /* translate and rotate vert */ + rect[i * 6 + 0] = xpos + x * cos(angle) + y * sin(angle); + rect[i * 6 + 1] = ypos + x * sin(angle) - y * cos(angle); + } + + glUnmapBufferARB(GL_ARRAY_BUFFER_ARB); +} + + +static void +LoadBuffer(void) +{ + static int frame = 0; + float angle = glutGet(GLUT_ELAPSED_TIME) * 0.001; + UpdateRect(frame % NumRects, angle); + frame++; +} + + +static void +Draw(void) +{ + glBindBufferARB(GL_ARRAY_BUFFER_ARB, BufferID); + glVertexPointer(3, GL_FLOAT, 24, 0); + glEnable(GL_VERTEX_ARRAY); + + glColorPointer(3, GL_FLOAT, 24, (void*) 12); + glEnable(GL_COLOR_ARRAY); + + glDrawArrays(GL_QUADS, 0, NumRects * 4); + + if (0) + glFinish(); +} + + +static void +Display(void) +{ + glClear(GL_COLOR_BUFFER_BIT); + Draw(); + glutSwapBuffers(); +} + + +static void +Reshape(int width, int height) +{ + glViewport(0, 0, width, height); + glMatrixMode(GL_PROJECTION); + glLoadIdentity(); + glOrtho(-3.0, 3.0, -1.0, 1.0, -1.0, 1.0); + glMatrixMode(GL_MODELVIEW); + glLoadIdentity(); +} + + +static void +Idle(void) +{ + LoadBuffer(); + glutPostRedisplay(); +} + + +static void +Key(unsigned char key, int x, int y) +{ + (void) x; + (void) y; + if (key == 'a') { + Anim = !Anim; + glutIdleFunc(Anim ? Idle : NULL); + } + else if (key == 's') { + LoadBuffer(); + } + else if (key == 27) { + glutDestroyWindow(Win); + exit(0); + } + glutPostRedisplay(); +} + + +static void +Init(void) +{ + GLuint BufferSize = NumRects * sizeof(RectData); + float *buf; + + if (!glutExtensionSupported("GL_ARB_vertex_buffer_object")) { + printf("GL_ARB_vertex_buffer_object not found!\n"); + exit(0); + } + + UseBufferRange = glutExtensionSupported("GL_ARB_map_buffer_range"); + printf("Use GL_ARB_map_buffer_range: %c\n", "NY"[UseBufferRange]); + + printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER)); + + /* initially load buffer with zeros */ + buf = (float *) calloc(1, BufferSize); + + glGenBuffersARB(1, &BufferID); + glBindBufferARB(GL_ARRAY_BUFFER_ARB, BufferID); + glBufferDataARB(GL_ARRAY_BUFFER_ARB, BufferSize, buf, GL_DYNAMIC_DRAW_ARB); + + free(buf); +} + + +int +main(int argc, char *argv[]) +{ + glutInit(&argc, argv); + glutInitWindowSize(800, 200); + glutInitDisplayMode(GLUT_RGB | GLUT_DOUBLE); + Win = glutCreateWindow(argv[0]); + glewInit(); + glutReshapeFunc(Reshape); + glutKeyboardFunc(Key); + glutDisplayFunc(Display); + glutIdleFunc(Anim ? Idle : NULL); + Init(); + glutMainLoop(); + return 0; +} |