Re: [AD] bcb9eb95afc5aa00990627a7c27a954b549ecea7 breaks shader

[Trent Gamblin <nooskewl@xxxxxxxxxx>]

I figured out a way to "fix" it in my code, but I'm thinking there's probably a way to automate this. Maybe Peter knows, since he wrote most of the new code. This function is what I'm using now:

void use_shader(ALLEGRO_SHADER *shader)
{
	ALLEGRO_TRANSFORM v, p;
	al_copy_transform(&v, al_get_current_transform());
	al_copy_transform(&p, al_get_projection_transform(display));
	al_use_shader(shader);
	al_use_transform(&v);
	al_set_projection_transform(display, &p);
}

Trent

On 2013-03-14, at 2:03 PM, Trent Gamblin <nooskewl@xxxxxxxxxx> wrote:

> This revision breaks one of my shaders for some unknown reason. If I fudge the glGetUniformLocation back in where the projview matrix is set, it works. By breaking I mean it outputs nothing but black. My vertex shader is the default and pixel shader is below.
> 
> Trent
> 
> 		const char *tinter_pixel_source =
> #if defined OPENGLES
> 		"precision mediump float;\n"
> #endif
> 		"uniform sampler2D " ALLEGRO_SHADER_VAR_TEX ";\n"
> 		"varying vec4 varying_color;\n"
> 		"varying vec2 varying_texcoord;\n"
> 		"uniform float r;\n"
> 		"uniform float g;\n"
> 		"uniform float b;\n"
> 		"uniform float ratio;\n"
> 		"void main() {\n"
> 		"   float avg, dr, dg, db;\n"
> 		"   vec4 color = varying_color;\n"
> 		"   vec4 coord = vec4(varying_texcoord, 0.0, 1.0);\n"
> 		"   color *= texture2D(" ALLEGRO_SHADER_VAR_TEX ", coord.st);\n"
> 		"   avg = (color.r + color.g + color.b) / 3.0;\n"
> 		"   dr = avg * r;\n"
> 		"   dg = avg * g;\n"
> 		"   db = avg * b;\n"
> 		"   color.r = color.r - (ratio * (color.r - dr));\n"
> 		"   color.g = color.g - (ratio * (color.g - dg));\n"
> 		"   color.b = color.b - (ratio * (color.b - db));\n"
> 		"   gl_FragColor = color;\n"
> 		"}";
> 
> 
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