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custom renderer, draw quad

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This commit is contained in:
Hannes Janetzek 2013-02-01 16:21:07 +01:00
parent 373d45e008
commit f7b00b9692
1 changed files with 17 additions and 9 deletions
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26
src/org/oscim/renderer/overlays/CustomOverlay.java
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@ -37,9 +37,10 @@ public class CustomOverlay extends RenderOverlay {
private FloatBuffer mVertices;
private final float[] mVerticesData = {
0, 200, 0,
-200, -200, 0,
200, -200, 0
-200, -200, 1.0f,
200, 200, 0,
-200, 200, 0.5f,
200, -200, 0.5f,
};
private boolean mInitialized;
@ -54,11 +55,11 @@ public class CustomOverlay extends RenderOverlay {
if (!init())
return;
mInitialized = true;
// tell GLRender to call 'compile' when data has changed
newData = true;
mInitialized = true;
// fix current MapPosition
updateMapPosition();
}
@ -91,8 +92,11 @@ public class CustomOverlay extends RenderOverlay {
GLES20.glBindBuffer(GLES20.GL_ARRAY_BUFFER, 0);
// Load the vertex data
mVertices.position(0);
//mVertices.position(0);
GLES20.glVertexAttribPointer(hVertexPosition, 3, GLES20.GL_FLOAT, false, 0, mVertices);
//mVertices.position(2);
//GLES20.glVertexAttribPointer(hVertexPosition, 2, GLES20.GL_FLOAT, false, 4, mVertices);
GLState.enableVertexArrays(hVertexPosition, -1);
/* apply view and projection matrices */
@ -106,7 +110,7 @@ public class CustomOverlay extends RenderOverlay {
GLES20.glUniformMatrix4fv(hMatrixPosition, 1, false, tmp, 0);
// Draw the triangle
GLES20.glDrawArrays(GLES20.GL_TRIANGLES, 0, 3);
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_STRIP, 0, 4);
GlUtils.checkGlError("...");
}
@ -120,6 +124,7 @@ public class CustomOverlay extends RenderOverlay {
// Handle for vertex position in shader
hVertexPosition = GLES20.glGetAttribLocation(programObject, "a_pos");
hMatrixPosition = GLES20.glGetUniformLocation(programObject, "u_mvp");
// Store the program object
@ -135,16 +140,19 @@ public class CustomOverlay extends RenderOverlay {
"precision mediump float;"
+ "uniform mat4 u_mvp;"
+ "attribute vec4 a_pos;"
+ "varying float alpha;"
+ "void main()"
+ "{"
+ " gl_Position = u_mvp * a_pos;"
+ " gl_Position = u_mvp * vec4(a_pos.xy, 0.0, 1.0);"
+ " alpha = a_pos.z;"
+ "}";
private final static String fShaderStr =
"precision mediump float;"
+ "varying float alpha;"
+ "void main()"
+ "{"
+ " gl_FragColor = vec4 ( 0.0, 0.0, 0.0, 0.7 );"
+ " gl_FragColor = vec4 (alpha, 1.0-alpha, 0.0, 0.7 );"
+ "}";
}