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Code Issues Releases Wiki Activity

rework Gradient to use VBO

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fgenesis 2025-03-12 02:39:23 +01:00
parent e255e5333d
commit d73c7e741f
2 changed files with 37 additions and 21 deletions
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55
BBGE/Gradient.cpp
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@ -23,6 +23,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#include "RenderBase.h"
Gradient::Gradient() : RenderObject()
, vbo(GPUBUF_VERTEXBUF | GPUBUF_DYNAMIC)
{
autoWidth = autoHeight = 0;
}
@ -48,6 +49,7 @@ void Gradient::makeVertical(Vector c1, Vector c2)
ulc1 = c1;
ulc2 = c2;
ulc3 = c2;
updateVBO();
}
void Gradient::makeHorizontal(Vector c1, Vector c2)
@ -56,30 +58,41 @@ void Gradient::makeHorizontal(Vector c1, Vector c2)
ulc1 = c2;
ulc2 = c2;
ulc3 = c1;
updateVBO();
}
void Gradient::updateVBO()
{
const size_t bytes = 4 * 6 * sizeof(float);
do
{
float *p = (float*)vbo.beginWrite(GPUBUFTYPE_VEC2_RGBA, bytes, GPUACCESS_DEFAULT);
Vector c = _NoInit();
*p++ = 0.5f; *p++ = 0.5f;
c = ulc3;
*p++ = c.x; *p++ = c.y; *p++ = c.z; *p++ = alpha.x;
*p++ = -0.5f; *p++ = 0.5f;
c = ulc2;
*p++ = c.x; *p++ = c.y; *p++ = c.z; *p++ = alpha.x;
*p++ = 0.5f; *p++ = -0.5f;
c = ulc0;
*p++ = c.x; *p++ = c.y; *p++ = c.z; *p++ = alpha.x;
*p++ = -0.5f; *p++ = -0.5f;
c = ulc1;
*p++ = c.x; *p++ = c.y; *p++ = c.z; *p++ = alpha.x;
}
while(!vbo.commitWrite());
}
void Gradient::onRender(const RenderState& rs) const
{
glBegin(GL_QUADS);
glColor4f(ulc2.x*color.x, ulc2.y*color.y, ulc2.z*color.z, alpha.x);
glVertex3f(-0.5, 0.5, 0.0f);
glColor4f(ulc3.x*color.x, ulc3.y*color.y, ulc3.z*color.z, alpha.x);
glVertex3f( 0.5, 0.5, 0.0f);
glColor4f(ulc0.x*color.x, ulc0.y*color.y, ulc0.z*color.z, alpha.x);
glVertex3f( 0.5, -0.5, 0.0f);
glColor4f(ulc1.x*color.x, ulc1.y*color.y, ulc1.z*color.z, alpha.x);
glVertex3f(-0.5, -0.5, 0.0f);
glEnd();
vbo.apply();
glDrawArrays(GL_TRIANGLE_STRIP, 0, 4);
}

3
BBGE/Gradient.h
View file

@ -22,6 +22,7 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
#define GRADIENT_H
#include "RenderObject.h"
#include "VertexBuffer.h"
class Gradient : public RenderObject
@ -36,7 +37,9 @@ public:
int autoWidth, autoHeight;
protected:
void onRender(const RenderState& rs) const OVERRIDE;
void updateVBO();
Vector ulc0, ulc1, ulc2, ulc3;
DynamicGPUBuffer vbo;
};
#endif