41 lines
907 B
C++
41 lines
907 B
C++
#include "MeterContext.h"
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#include "MeterCanvas.h"
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MeterContext::MeterContext(MeterCanvas *canvas, wxGLContext *sharedContext) :
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PrimaryGLContext(canvas, sharedContext) {
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glDisable(GL_CULL_FACE);
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glDisable(GL_DEPTH_TEST);
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glMatrixMode(GL_PROJECTION);
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glLoadIdentity();
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}
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void MeterContext::DrawBegin() {
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glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
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glMatrixMode(GL_MODELVIEW);
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glLoadIdentity();
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glDisable(GL_TEXTURE_2D);
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}
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void MeterContext::Draw(float r, float g, float b, float a, float level) {
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glEnable(GL_BLEND);
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glBlendFunc(GL_ONE, GL_ONE);
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glColor4f(r, g, b, a);
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glBegin(GL_QUADS);
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glVertex2f(1.0, -1.0 + 2.0 * level);
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glVertex2f(-1.0, -1.0 + 2.0 * level);
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glVertex2f(-1.0, -1.0);
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glVertex2f(1.0, -1.0);
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glEnd();
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glDisable(GL_BLEND);
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}
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void MeterContext::DrawEnd() {
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glFlush();
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CheckGLError();
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}
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