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Use FBO for particles

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This commit is contained in:
Simon Robertshaw 2011-10-20 22:22:18 +01:00
parent eaafcaeecc
commit e6d4073f5b
2 changed files with 58 additions and 4 deletions
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60
src/graphics.c
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@ -27,7 +27,7 @@ unsigned cmode = CM_FIRE;
SDL_Surface *sdl_scrn;
int sdl_scale = 1;
GLuint vidBuf, airBuf, fireAlpha, glowAlpha, blurAlpha, fireProg;
GLuint vidBuf, airBuf, fireAlpha, glowAlpha, blurAlpha, fireProg, partsFboTex, partsFbo;
int sandcolour_r = 0;
int sandcolour_g = 0;
@ -291,6 +291,10 @@ pixel *rescale_img(pixel *src, int sw, int sh, int *qw, int *qh, int f)
void clearScreen(float alpha)
{
glClearColor(0.0f, 0.0f, 0.0f, alpha);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, partsFbo);
glClear(GL_COLOR_BUFFER_BIT);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glClearColor(0.0f, 0.0f, 0.0f, 1.0f);
glClear(GL_COLOR_BUFFER_BIT);
}
@ -1804,7 +1808,11 @@ void render_parts(pixel *vid)
#ifdef OGLR
//Set coord offset
glScalef(1,-1,1);
glTranslatef(0, -(YRES+MENUSIZE), 0);
glTranslatef(0, -YRES/*-(YRES+MENUSIZE)*/, 0);
//Render to the particle FBO
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, partsFbo);
//glDrawBuffers(1, fboBuff);
//Go into array mode
glEnableClientState(GL_COLOR_ARRAY);
@ -1900,7 +1908,7 @@ void render_parts(pixel *vid)
//Start and prepare fire program
glEnable(GL_TEXTURE_2D);
glUseProgram(fireProg);
glActiveTexture(GL_TEXTURE0);
//glActiveTexture(GL_TEXTURE0);
glBindTexture(GL_TEXTURE_2D, fireAlpha);
glUniform1i(glGetUniformLocation(fireProg, "fireAlpha"), 0);
@ -1944,6 +1952,29 @@ void render_parts(pixel *vid)
glDisableClientState(GL_COLOR_ARRAY);
glDisableClientState(GL_VERTEX_ARRAY);
//Reset FBO
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0);
glTranslatef(0, -MENUSIZE, 0);
//TODO: Do shit on the fbo like gravity lensing or turning stickmen into turds here
//Drawing the FBO onto the screen sounds like a cool idea now
glEnable( GL_TEXTURE_2D );
glBindTexture(GL_TEXTURE_2D, partsFboTex);
//glColor4f(1.0f, 1.0f, 1.0f, 1.0f);
//glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, XRES/CELL, YRES/CELL, GL_BGRA, GL_UNSIGNED_BYTE, air_buf);
glBegin(GL_QUADS);
glTexCoord2d(1, 0);
glVertex3f(XRES*sdl_scale, (YRES)*sdl_scale, 1.0);
glTexCoord2d(0, 0);
glVertex3f(0, (YRES)*sdl_scale, 1.0);
glTexCoord2d(0, 1);
glVertex3f(0, 0, 1.0);
glTexCoord2d(1, 1);
glVertex3f(XRES*sdl_scale, 0, 1.0);
glEnd();
glDisable( GL_TEXTURE_2D );
//Reset coords/offset
glTranslatef(0, YRES+MENUSIZE, 0);
glScalef(1,-1,1);
@ -3038,7 +3069,25 @@ int sdl_open(void)
glEnable(GL_BLEND);
glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
//FBO Texture
glEnable(GL_TEXTURE_2D);
glGenTextures(1, &partsFboTex);
glBindTexture(GL_TEXTURE_2D, partsFboTex);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA8, XRES, YRES, 0, GL_RGBA, GL_FLOAT, NULL);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MAG_FILTER,GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_MIN_FILTER,GL_NEAREST);
//FBO
glGenFramebuffers(1, &partsFbo);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, partsFbo);
glEnable(GL_BLEND);
glFramebufferTexture2D(GL_DRAW_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, partsFboTex, 0);
glBindTexture(GL_TEXTURE_2D, 0);
glBindFramebuffer(GL_DRAW_FRAMEBUFFER, 0); // Reset framebuffer binding
glDisable(GL_TEXTURE_2D);
//Texture for main UI
glEnable(GL_TEXTURE_2D);
glGenTextures(1, &vidBuf);
glBindTexture(GL_TEXTURE_2D, vidBuf);
@ -3050,6 +3099,7 @@ int sdl_open(void)
glBindTexture(GL_TEXTURE_2D, 0);
glDisable(GL_TEXTURE_2D);
//Texture for air to be drawn
glEnable(GL_TEXTURE_2D);
glGenTextures(1, &airBuf);
glBindTexture(GL_TEXTURE_2D, airBuf);
@ -3061,6 +3111,7 @@ int sdl_open(void)
glBindTexture(GL_TEXTURE_2D, 0);
glDisable(GL_TEXTURE_2D);
//Fire alpha texture
glEnable(GL_TEXTURE_2D);
glGenTextures(1, &fireAlpha);
glBindTexture(GL_TEXTURE_2D, fireAlpha);
@ -3072,6 +3123,7 @@ int sdl_open(void)
glBindTexture(GL_TEXTURE_2D, 0);
glDisable(GL_TEXTURE_2D);
//Glow alpha texture
glEnable(GL_TEXTURE_2D);
glGenTextures(1, &glowAlpha);
glBindTexture(GL_TEXTURE_2D, glowAlpha);
@ -3083,6 +3135,8 @@ int sdl_open(void)
glBindTexture(GL_TEXTURE_2D, 0);
glDisable(GL_TEXTURE_2D);
//Blur Alpha texture
glEnable(GL_TEXTURE_2D);
glGenTextures(1, &blurAlpha);
glBindTexture(GL_TEXTURE_2D, blurAlpha);

2
src/main.c
View File

@ -1784,7 +1784,7 @@ int main(int argc, char *argv[])
#ifdef OGLR
if (cmode==CM_PERS)//save background for persistent, then clear
{
clearScreen(1.0f);
clearScreen(0.01f);
memset(part_vbuf, 0, (XRES+BARSIZE)*YRES*PIXELSIZE);
}
else //clear screen every frame