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Cleanup OpenGL texture for optimal performance: using GL4 glTexStorage2D

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with RGBA8 (most efficient implementation in hardware).
This commit is contained in:
brunoherbelin
2020-07-30 00:13:46 +02:00
parent 4f17620cae
commit 4f3114770d
5 changed files with 39 additions and 27 deletions
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29
View.cpp
View File

@@ -28,8 +28,6 @@
#include "UpdateCallback.h"
#include "Log.h"
#define CIRCLE_PIXELS 64
#define CIRCLE_PIXEL_RADIUS 1024.0
bool View::need_deep_update_ = true;
@@ -418,6 +416,13 @@ void MixingView::setAlpha(Source *s)
s->touch();
}
#define CIRCLE_PIXELS 64
#define CIRCLE_PIXEL_RADIUS 1024.0
//#define CIRCLE_PIXELS 256
//#define CIRCLE_PIXEL_RADIUS 16384.0
//#define CIRCLE_PIXELS 1024
//#define CIRCLE_PIXEL_RADIUS 262144.0
float sin_quad_texture(float x, float y) {
return 0.5f + 0.5f * cos( M_PI * CLAMP( ( ( x * x ) + ( y * y ) ) / CIRCLE_PIXEL_RADIUS, 0.f, 1.f ) );
}
@@ -427,8 +432,6 @@ uint MixingView::textureMixingQuadratic()
static GLuint texid = 0;
if (texid == 0) {
// generate the texture with alpha exactly as computed for sources
glGenTextures(1, &texid);
glBindTexture(GL_TEXTURE_2D, texid);
GLubyte matrix[CIRCLE_PIXELS*CIRCLE_PIXELS * 4];
GLubyte color[4] = {0,0,0,0};
GLfloat luminance = 1.f;
@@ -447,27 +450,31 @@ uint MixingView::textureMixingQuadratic()
// transparency
alpha = 255.f * CLAMP( distance , 0.f, 1.f);
color[3] = static_cast<GLubyte>(alpha);
// luminance adjustment
luminance = 255.f * CLAMP( 0.2f + 0.75f * distance, 0.f, 1.f);
color[0] = color[1] = color[2] = static_cast<GLubyte>(luminance);
// 1st quadrant
memmove(&matrix[ j * 4 + i * CIRCLE_PIXELS * 4 ], color, 4);
memmove(&matrix[ j * 4 + i * CIRCLE_PIXELS * 4 ], color, 4 * sizeof(GLubyte));
// 4nd quadrant
memmove(&matrix[ (CIRCLE_PIXELS -j -1)* 4 + i * CIRCLE_PIXELS * 4 ], color, 4);
memmove(&matrix[ (CIRCLE_PIXELS -j -1)* 4 + i * CIRCLE_PIXELS * 4 ], color, 4 * sizeof(GLubyte));
// 3rd quadrant
memmove(&matrix[ j * 4 + (CIRCLE_PIXELS -i -1) * CIRCLE_PIXELS * 4 ], color, 4);
memmove(&matrix[ j * 4 + (CIRCLE_PIXELS -i -1) * CIRCLE_PIXELS * 4 ], color, 4 * sizeof(GLubyte));
// 4th quadrant
memmove(&matrix[ (CIRCLE_PIXELS -j -1) * 4 + (CIRCLE_PIXELS -i -1) * CIRCLE_PIXELS * 4 ], color, 4);
memmove(&matrix[ (CIRCLE_PIXELS -j -1) * 4 + (CIRCLE_PIXELS -i -1) * CIRCLE_PIXELS * 4 ], color, 4 * sizeof(GLubyte));
++c;
}
++l;
}
// two components texture : luminance and alpha
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
// setup texture
glGenTextures(1, &texid);
glBindTexture(GL_TEXTURE_2D, texid);
glTexStorage2D(GL_TEXTURE_2D, 1, GL_RGBA8, CIRCLE_PIXELS, CIRCLE_PIXELS);
glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0, CIRCLE_PIXELS, CIRCLE_PIXELS, GL_BGRA, GL_UNSIGNED_BYTE, matrix);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, CIRCLE_PIXELS, CIRCLE_PIXELS, 0, GL_RGBA, GL_UNSIGNED_BYTE, (float *) matrix);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
}
return texid;