libpsys

annotate src/psys_gl.c @ 20:0a53b22f7caf

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the billboarding was wrong ...
author John Tsiombikas <nuclear@member.fsf.org>
date Tue, 18 Sep 2012 09:38:48 +0300
parents 3871a45a4e4b
children
rev   line source
nuclear@5 1 #include <string.h>
nuclear@5 2 #include <errno.h>
nuclear@16 3 #include <assert.h>
nuclear@5 4
nuclear@0 5 #ifndef __APPLE__
nuclear@5 6 #ifdef WIN32
nuclear@5 7 #include <windows.h>
nuclear@5 8 #endif
nuclear@5 9
nuclear@0 10 #include <GL/gl.h>
nuclear@0 11 #else
nuclear@0 12 #include <OpenGL/gl.h>
nuclear@0 13 #endif
nuclear@0 14
nuclear@5 15 #include <imago2.h>
nuclear@5 16 #include "psys.h"
nuclear@5 17 #include "psys_gl.h"
nuclear@0 18
nuclear@0 19 void psys_gl_draw_start(struct psys_emitter *em, void *cls)
nuclear@0 20 {
nuclear@0 21 glPushAttrib(GL_ENABLE_BIT);
nuclear@0 22 glDisable(GL_LIGHTING);
nuclear@0 23
nuclear@2 24 glEnable(GL_BLEND);
nuclear@3 25 glBlendFunc(GL_SRC_ALPHA, GL_ONE);
nuclear@2 26
nuclear@5 27 if(em->attr.tex) {
nuclear@2 28 glEnable(GL_TEXTURE_2D);
nuclear@5 29 glBindTexture(GL_TEXTURE_2D, em->attr.tex);
nuclear@2 30 }
nuclear@2 31
nuclear@0 32 glDepthMask(0);
nuclear@0 33 }
nuclear@0 34
nuclear@0 35 void psys_gl_draw(struct psys_emitter *em, struct psys_particle *p, void *cls)
nuclear@0 36 {
nuclear@0 37 float hsz = p->size / 2.0;
nuclear@0 38
nuclear@20 39 float xform[16];
nuclear@20 40
nuclear@20 41 glMatrixMode(GL_MODELVIEW);
nuclear@20 42 glPushMatrix();
nuclear@20 43
nuclear@20 44 glTranslatef(p->pos.x, p->pos.y, p->pos.z);
nuclear@20 45
nuclear@20 46 glGetFloatv(GL_MODELVIEW_MATRIX, xform);
nuclear@20 47 xform[0] = xform[5] = xform[10] = 1.0;
nuclear@20 48 xform[1] = xform[2] = xform[4] = xform[6] = xform[8] = xform[9] = 0.0;
nuclear@20 49 glLoadMatrixf(xform);
nuclear@20 50
nuclear@20 51 glBegin(GL_QUADS);
nuclear@9 52 glColor4f(p->color.x, p->color.y, p->color.z, p->alpha);
nuclear@9 53
nuclear@0 54 glTexCoord2f(0, 0);
nuclear@20 55 glVertex2f(-hsz, -hsz);
nuclear@0 56
nuclear@0 57 glTexCoord2f(1, 0);
nuclear@20 58 glVertex2f(hsz, -hsz);
nuclear@0 59
nuclear@0 60 glTexCoord2f(1, 1);
nuclear@20 61 glVertex2f(hsz, hsz);
nuclear@0 62
nuclear@0 63 glTexCoord2f(0, 1);
nuclear@20 64 glVertex2f(-hsz, hsz);
nuclear@20 65 glEnd();
nuclear@20 66
nuclear@20 67 glMatrixMode(GL_MODELVIEW);
nuclear@20 68 glPopMatrix();
nuclear@0 69 }
nuclear@0 70
nuclear@0 71 void psys_gl_draw_end(struct psys_emitter *em, void *cls)
nuclear@0 72 {
nuclear@0 73 glDepthMask(1);
nuclear@0 74 glPopAttrib();
nuclear@0 75 }
nuclear@5 76
nuclear@5 77
nuclear@5 78 unsigned int psys_gl_load_texture(const char *fname, void *cls)
nuclear@5 79 {
nuclear@5 80 unsigned int tex;
nuclear@5 81 void *pixels;
nuclear@5 82 int xsz, ysz;
nuclear@5 83
nuclear@5 84 if(!(pixels = img_load_pixels(fname, &xsz, &ysz, IMG_FMT_RGBA32))) {
nuclear@5 85 return 0;
nuclear@5 86 }
nuclear@16 87 printf("%s: creating texture %s (%dx%d)\n", __func__, fname, xsz, ysz);
nuclear@5 88
nuclear@5 89 glGenTextures(1, &tex);
nuclear@5 90 glBindTexture(GL_TEXTURE_2D, tex);
nuclear@5 91 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
nuclear@5 92 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
nuclear@5 93 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP);
nuclear@5 94 glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP);
nuclear@16 95 glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, xsz, ysz, 0, GL_RGBA, GL_UNSIGNED_BYTE, pixels);
nuclear@16 96
nuclear@16 97 assert(glGetError() == GL_NO_ERROR);
nuclear@5 98
nuclear@5 99 img_free_pixels(pixels);
nuclear@5 100 return tex;
nuclear@5 101 }
nuclear@5 102
nuclear@5 103 void psys_gl_unload_texture(unsigned int tex, void *cls)
nuclear@5 104 {
nuclear@5 105 glDeleteTextures(1, &tex);
nuclear@5 106 }