[Mesa-dev] [PATCH 1/5] mesa: Refactor viewport transform computation.
Mathias.Froehlich at gmx.net
Mathias.Froehlich at gmx.net
Fri Oct 24 00:26:53 PDT 2014
From: Mathias Fröhlich <Mathias.Froehlich at gmx.net>
This is for preparation of ARB_clip_control.
v3:
Add comments.
Signed-off-by: Mathias Froehlich <Mathias.Froehlich at web.de>
---
src/mesa/drivers/dri/i915/i915_state.c | 26 ++++++----------
src/mesa/main/state.c | 9 +++---
src/mesa/main/viewport.c | 52 +++++++++++++++++++++----------
src/mesa/main/viewport.h | 3 ++
src/mesa/math/m_matrix.c | 17 +++++-----
src/mesa/math/m_matrix.h | 4 +--
src/mesa/state_tracker/st_atom_viewport.c | 23 ++++++--------
7 files changed, 73 insertions(+), 61 deletions(-)
diff --git a/src/mesa/drivers/dri/i915/i915_state.c b/src/mesa/drivers/dri/i915/i915_state.c
index f31b271..f9aecba 100644
--- a/src/mesa/drivers/dri/i915/i915_state.c
+++ b/src/mesa/drivers/dri/i915/i915_state.c
@@ -34,6 +34,7 @@
#include "main/dd.h"
#include "main/state.h"
#include "main/stencil.h"
+#include "main/viewport.h"
#include "tnl/tnl.h"
#include "tnl/t_context.h"
@@ -401,26 +402,17 @@ void
intelCalcViewport(struct gl_context * ctx)
{
struct intel_context *intel = intel_context(ctx);
+ double scale[3], translate[3];
+
+ _mesa_get_viewport_xform(ctx, 0, scale, translate);
if (_mesa_is_winsys_fbo(ctx->DrawBuffer)) {
- _math_matrix_viewport(&intel->ViewportMatrix,
- ctx->ViewportArray[0].X,
- ctx->DrawBuffer->Height - ctx->ViewportArray[0].Y,
- ctx->ViewportArray[0].Width,
- -ctx->ViewportArray[0].Height,
- ctx->ViewportArray[0].Near,
- ctx->ViewportArray[0].Far,
- 1.0);
- } else {
- _math_matrix_viewport(&intel->ViewportMatrix,
- ctx->ViewportArray[0].X,
- ctx->ViewportArray[0].Y,
- ctx->ViewportArray[0].Width,
- ctx->ViewportArray[0].Height,
- ctx->ViewportArray[0].Near,
- ctx->ViewportArray[0].Far,
- 1.0);
+ scale[1] = -scale[1];
+ translate[1] = ctx->DrawBuffer->Height - translate[1];
}
+
+ _math_matrix_viewport(&intel->ViewportMatrix,
+ scale, translate, 1.0);
}
diff --git a/src/mesa/main/state.c b/src/mesa/main/state.c
index 80287c4..3dbbfaa 100644
--- a/src/mesa/main/state.c
+++ b/src/mesa/main/state.c
@@ -51,6 +51,7 @@
#include "texobj.h"
#include "texstate.h"
#include "varray.h"
+#include "viewport.h"
#include "blend.h"
@@ -281,11 +282,11 @@ update_viewport_matrix(struct gl_context *ctx)
* NOTE: RasterPos uses this.
*/
for (i = 0; i < ctx->Const.MaxViewports; i++) {
+ double scale[3], translate[3];
+
+ _mesa_get_viewport_xform(ctx, i, scale, translate);
_math_matrix_viewport(&ctx->ViewportArray[i]._WindowMap,
- ctx->ViewportArray[i].X, ctx->ViewportArray[i].Y,
- ctx->ViewportArray[i].Width, ctx->ViewportArray[i].Height,
- ctx->ViewportArray[i].Near, ctx->ViewportArray[i].Far,
- depthMax);
+ scale, translate, depthMax);
}
}
diff --git a/src/mesa/main/viewport.c b/src/mesa/main/viewport.c
index 222ae30..afc813d 100644
--- a/src/mesa/main/viewport.c
+++ b/src/mesa/main/viewport.c
@@ -39,6 +39,8 @@ set_viewport_no_notify(struct gl_context *ctx, unsigned idx,
GLfloat x, GLfloat y,
GLfloat width, GLfloat height)
{
+ double scale[3], translate[3];
+
/* clamp width and height to the implementation dependent range */
width = MIN2(width, (GLfloat) ctx->Const.MaxViewportWidth);
height = MIN2(height, (GLfloat) ctx->Const.MaxViewportHeight);
@@ -75,14 +77,9 @@ set_viewport_no_notify(struct gl_context *ctx, unsigned idx,
* the WindowMap matrix being up to date in the driver's Viewport
* and DepthRange functions.
*/
+ _mesa_get_viewport_xform(ctx, idx, scale, translate);
_math_matrix_viewport(&ctx->ViewportArray[idx]._WindowMap,
- ctx->ViewportArray[idx].X,
- ctx->ViewportArray[idx].Y,
- ctx->ViewportArray[idx].Width,
- ctx->ViewportArray[idx].Height,
- ctx->ViewportArray[idx].Near,
- ctx->ViewportArray[idx].Far,
- ctx->DrawBuffer->_DepthMaxF);
+ scale, translate, ctx->DrawBuffer->_DepthMaxF);
#endif
}
@@ -248,6 +245,8 @@ static void
set_depth_range_no_notify(struct gl_context *ctx, unsigned idx,
GLclampd nearval, GLclampd farval)
{
+ double scale[3], translate[3];
+
if (ctx->ViewportArray[idx].Near == nearval &&
ctx->ViewportArray[idx].Far == farval)
return;
@@ -261,14 +260,9 @@ set_depth_range_no_notify(struct gl_context *ctx, unsigned idx,
* the WindowMap matrix being up to date in the driver's Viewport
* and DepthRange functions.
*/
+ _mesa_get_viewport_xform(ctx, idx, scale, translate);
_math_matrix_viewport(&ctx->ViewportArray[idx]._WindowMap,
- ctx->ViewportArray[idx].X,
- ctx->ViewportArray[idx].Y,
- ctx->ViewportArray[idx].Width,
- ctx->ViewportArray[idx].Height,
- ctx->ViewportArray[idx].Near,
- ctx->ViewportArray[idx].Far,
- ctx->DrawBuffer->_DepthMaxF);
+ scale, translate, ctx->DrawBuffer->_DepthMaxF);
#endif
}
@@ -400,6 +394,8 @@ void _mesa_init_viewport(struct gl_context *ctx)
* so just initialize all of them.
*/
for (i = 0; i < MAX_VIEWPORTS; i++) {
+ double scale[3], translate[3];
+
/* Viewport group */
ctx->ViewportArray[i].X = 0;
ctx->ViewportArray[i].Y = 0;
@@ -409,8 +405,9 @@ void _mesa_init_viewport(struct gl_context *ctx)
ctx->ViewportArray[i].Far = 1.0;
_math_matrix_ctr(&ctx->ViewportArray[i]._WindowMap);
- _math_matrix_viewport(&ctx->ViewportArray[i]._WindowMap, 0, 0, 0, 0,
- 0.0F, 1.0F, depthMax);
+ _mesa_get_viewport_xform(ctx, i, scale, translate);
+ _math_matrix_viewport(&ctx->ViewportArray[i]._WindowMap,
+ scale, translate, depthMax);
}
}
@@ -427,3 +424,26 @@ void _mesa_free_viewport_data(struct gl_context *ctx)
_math_matrix_dtr(&ctx->ViewportArray[i]._WindowMap);
}
+/**
+ * Computes the scaling and the translation part of the
+ * viewport transform matrix of the \param i-th viewport
+ * and writes that into \param scale and \param translate.
+ */
+void
+_mesa_get_viewport_xform(struct gl_context *ctx, unsigned i,
+ double scale[3], double translate[3])
+{
+ double x = ctx->ViewportArray[i].X;
+ double y = ctx->ViewportArray[i].Y;
+ double half_width = 0.5*ctx->ViewportArray[i].Width;
+ double half_height = 0.5*ctx->ViewportArray[i].Height;
+ double n = ctx->ViewportArray[i].Near;
+ double f = ctx->ViewportArray[i].Far;
+
+ scale[0] = half_width;
+ translate[0] = half_width + x;
+ scale[1] = half_height;
+ translate[1] = half_height + y;
+ scale[2] = 0.5*(f - n);
+ translate[2] = 0.5*(n + f);
+}
diff --git a/src/mesa/main/viewport.h b/src/mesa/main/viewport.h
index f2311c0..514ff10 100644
--- a/src/mesa/main/viewport.h
+++ b/src/mesa/main/viewport.h
@@ -71,5 +71,8 @@ _mesa_init_viewport(struct gl_context *ctx);
extern void
_mesa_free_viewport_data(struct gl_context *ctx);
+extern void
+_mesa_get_viewport_xform(struct gl_context *ctx, unsigned i,
+ double scale[3], double translate[3]);
#endif
diff --git a/src/mesa/math/m_matrix.c b/src/mesa/math/m_matrix.c
index e512e45..9c9310d 100644
--- a/src/mesa/math/m_matrix.c
+++ b/src/mesa/math/m_matrix.c
@@ -1110,16 +1110,15 @@ _math_matrix_translate( GLmatrix *mat, GLfloat x, GLfloat y, GLfloat z )
* Transforms Normalized Device Coords to window/Z values.
*/
void
-_math_matrix_viewport(GLmatrix *m, GLfloat x, GLfloat y,
- GLfloat width, GLfloat height,
- GLdouble zNear, GLdouble zFar, GLdouble depthMax)
+_math_matrix_viewport(GLmatrix *m, const double scale[3],
+ const double translate[3], double depthMax)
{
- m->m[MAT_SX] = width / 2.0F;
- m->m[MAT_TX] = m->m[MAT_SX] + x;
- m->m[MAT_SY] = height / 2.0F;
- m->m[MAT_TY] = m->m[MAT_SY] + y;
- m->m[MAT_SZ] = (GLfloat) (depthMax * ((zFar - zNear) / 2.0));
- m->m[MAT_TZ] = (GLfloat) (depthMax * ((zFar - zNear) / 2.0 + zNear));
+ m->m[MAT_SX] = scale[0];
+ m->m[MAT_TX] = translate[0];
+ m->m[MAT_SY] = scale[1];
+ m->m[MAT_TY] = translate[1];
+ m->m[MAT_SZ] = depthMax*scale[2];
+ m->m[MAT_TZ] = depthMax*translate[2];
m->flags = MAT_FLAG_GENERAL_SCALE | MAT_FLAG_TRANSLATION;
m->type = MATRIX_3D_NO_ROT;
}
diff --git a/src/mesa/math/m_matrix.h b/src/mesa/math/m_matrix.h
index dddce70..778d716 100644
--- a/src/mesa/math/m_matrix.h
+++ b/src/mesa/math/m_matrix.h
@@ -122,8 +122,8 @@ _math_matrix_frustum( GLmatrix *mat,
GLfloat nearval, GLfloat farval );
extern void
-_math_matrix_viewport(GLmatrix *m, GLfloat x, GLfloat y, GLfloat width, GLfloat height,
- GLdouble zNear, GLdouble zFar, GLdouble depthMax);
+_math_matrix_viewport( GLmatrix *m, const double scale[3],
+ const double translate[3], double depthMax );
extern void
_math_matrix_set_identity( GLmatrix *dest );
diff --git a/src/mesa/state_tracker/st_atom_viewport.c b/src/mesa/state_tracker/st_atom_viewport.c
index 7584f9b..5b99208 100644
--- a/src/mesa/state_tracker/st_atom_viewport.c
+++ b/src/mesa/state_tracker/st_atom_viewport.c
@@ -27,6 +27,7 @@
#include "main/context.h"
+#include "main/viewport.h"
#include "st_context.h"
#include "st_atom.h"
#include "pipe/p_context.h"
@@ -63,21 +64,17 @@ update_viewport( struct st_context *st )
*/
for (i = 0; i < ctx->Const.MaxViewports; i++)
{
- GLfloat x = ctx->ViewportArray[i].X;
- GLfloat y = ctx->ViewportArray[i].Y;
- GLfloat z = ctx->ViewportArray[i].Near;
- GLfloat half_width = ctx->ViewportArray[i].Width * 0.5f;
- GLfloat half_height = ctx->ViewportArray[i].Height * 0.5f;
- GLfloat half_depth = (GLfloat)(ctx->ViewportArray[i].Far - ctx->ViewportArray[i].Near) * 0.5f;
-
- st->state.viewport[i].scale[0] = half_width;
- st->state.viewport[i].scale[1] = half_height * yScale;
- st->state.viewport[i].scale[2] = half_depth;
+ double scale[3], translate[3];
+ _mesa_get_viewport_xform(ctx, i, scale, translate);
+
+ st->state.viewport[i].scale[0] = scale[0];
+ st->state.viewport[i].scale[1] = scale[1] * yScale;
+ st->state.viewport[i].scale[2] = scale[2];
st->state.viewport[i].scale[3] = 1.0;
- st->state.viewport[i].translate[0] = half_width + x;
- st->state.viewport[i].translate[1] = (half_height + y) * yScale + yBias;
- st->state.viewport[i].translate[2] = half_depth + z;
+ st->state.viewport[i].translate[0] = translate[0];
+ st->state.viewport[i].translate[1] = translate[1] * yScale + yBias;
+ st->state.viewport[i].translate[2] = translate[2];
st->state.viewport[i].translate[3] = 0.0;
}
--
1.9.3
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