josh/JoshsOpenGLTest
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drawing one centered quad

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This commit is contained in:
Josh Holtrop 2012-11-29 22:57:49 -05:00
parent e43f1bfa16
commit a0bf1f8e4d
3 changed files with 25 additions and 35 deletions
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5
assets/shaders/fragment.glsl
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@ -1,8 +1,7 @@
varying vec2 tex_coord_i;
uniform sampler2D tex;
varying vec2 pos_2d_i;
void main()
{
gl_FragColor = texture2D(tex, tex_coord_i);
gl_FragColor = vec4(0, 0.3, 1, 1);
}

13
assets/shaders/vertex.glsl
View File

@ -1,12 +1,15 @@
uniform mat4 projection;
uniform mat4 modelview;
attribute vec3 pos;
attribute vec2 tex_coord;
varying vec2 tex_coord_i;
uniform vec2 offset;
attribute vec2 pos;
varying vec2 pos_2d_i;
void main()
{
gl_Position = projection * modelview * vec4(pos, 1);
tex_coord_i = tex_coord;
gl_Position = projection *
(modelview * vec4(pos, 0, 1) + vec4(offset, 0, 1));
pos_2d_i = pos + offset;
}

42
src/com/homelinux/holtrop/opengltest/MyRenderer.java
View File

@ -34,8 +34,9 @@ public class MyRenderer implements GLSurfaceView.Renderer
private int m_width;
private int m_height;
private float m_aspect = 1.0f;
private float m_x = 0.0f;
private float m_y = 0.0f;
private final int GRID_WIDTH = 16;
private final int GRID_HEIGHT = 9;
private float[][] m_tiles = new float[GRID_WIDTH][GRID_HEIGHT];
public MyRenderer(AssetManager am, Resources resources)
{
@ -93,10 +94,10 @@ public class MyRenderer implements GLSurfaceView.Renderer
public void onSurfaceCreated(GL10 unused, EGLConfig config)
{
final float attribs[] = {
1, 1, 0, 1, 1,
-1, 1, 0, 0, 1,
-1, -1, 0, 0, 0,
1, -1, 0, 1, 0,
1, 1,
-1, 1,
-1, -1,
1, -1
};
checkGLError("onSurfaceCreated");
ByteBuffer bb = ByteBuffer.allocateDirect(attribs.length * 4);
@ -122,6 +123,7 @@ public class MyRenderer implements GLSurfaceView.Renderer
Log.e(DBGTAG, "Program log: " + info_log);
}
/*
Bitmap texture = BitmapFactory.decodeResource(m_resources,
R.drawable.texture);
int[] textures = new int[1];
@ -139,6 +141,7 @@ public class MyRenderer implements GLSurfaceView.Renderer
GLES20.glGenerateMipmap(GLES20.GL_TEXTURE_2D);
checkGLError("glGenerateMipmap");
texture.recycle();
*/
GLES20.glClearColor(1.0f, 0.6f, 0.1f, 1.0f);
}
@ -147,32 +150,22 @@ public class MyRenderer implements GLSurfaceView.Renderer
{
GLES20.glClear(GLES20.GL_COLOR_BUFFER_BIT);
long time = SystemClock.uptimeMillis() % 4000L;
float angle = 0.090f * ((int) time);
Matrix.setIdentityM(m_modelview, 0);
Matrix.translateM(m_modelview, 0, m_x, m_y, 0);
Matrix.rotateM(m_modelview, 0, angle, 0, 0, 1);
Matrix.scaleM(m_modelview, 0, 0.4f, 0.4f, 0.4f);
Matrix.translateM(m_modelview, 0, 0, 0, 0);
GLES20.glUniformMatrix4fv(
GLES20.glGetUniformLocation(m_program, "modelview"),
1, false, m_modelview, 0);
int attr_pos = GLES20.glGetAttribLocation(m_program, "pos");
int attr_tex_coord = GLES20.glGetAttribLocation(m_program, "tex_coord");
checkGLError("glGetAttribLocation");
GLES20.glEnableVertexAttribArray(attr_pos);
GLES20.glEnableVertexAttribArray(attr_tex_coord);
checkGLError("glEnableVertexAttribArray");
m_quad_attrib_buffer.position(0);
GLES20.glVertexAttribPointer(attr_pos, 3, GLES20.GL_FLOAT, false,
5 * 4, m_quad_attrib_buffer);
m_quad_attrib_buffer.position(3);
GLES20.glVertexAttribPointer(attr_tex_coord, 2, GLES20.GL_FLOAT, false,
5 * 4, m_quad_attrib_buffer);
GLES20.glVertexAttribPointer(attr_pos, 2, GLES20.GL_FLOAT, false,
2 * 4, m_quad_attrib_buffer);
checkGLError("glVertexAttribPointer");
GLES20.glDrawArrays(GLES20.GL_TRIANGLE_FAN, 0, 4);
checkGLError("glDrawArrays");
GLES20.glDisableVertexAttribArray(attr_pos);
GLES20.glDisableVertexAttribArray(attr_tex_coord);
checkGLError("glDisableVertexAttribArray");
}
@ -185,8 +178,9 @@ public class MyRenderer implements GLSurfaceView.Renderer
GLES20.glViewport(0, 0, width, height);
Matrix.orthoM(m_proj_matrix, 0,
-m_aspect, m_aspect,
-1, 1, 1, -1);
-GRID_WIDTH / 2.0f, GRID_WIDTH / 2.0f,
-GRID_HEIGHT / 2.0f, GRID_HEIGHT / 2.0f,
1, -1);
GLES20.glUseProgram(m_program);
@ -200,12 +194,6 @@ public class MyRenderer implements GLSurfaceView.Renderer
if (e.getAction() == MotionEvent.ACTION_DOWN ||
e.getAction() == MotionEvent.ACTION_MOVE)
{
float x = m_aspect * ((e.getX() / (float) m_width) * 2.0f - 1.0f);
float y = -((e.getY() / (float) m_height) * 2.0f - 1.0f);
m_x = x;
m_y = y;
return true;
}